Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7df3c951bd5e39…

MALICIOUS

PDF

91.0 KB Created: 2021-03-12 21:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 343fcf9694f45fb00a9cd78926e2722a SHA-1: 9a5de6d52727ab3e2828be0521ec219dcfa2c08f SHA-256: 1f7df3c951bd5e399bff92e1c656d6e322054ea07170a5748b7639d5777ec42d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/wix?keyword=data+manager+file+explorer+apk PDF link annotation
    • https://relorurexo.weebly.com/uploads/1/3/5/3/135391300/4887109.pdfIn PDF document text
    • http://sokolov.fun/vons_grocery_palm_springs8ehdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fdfc4b9eeebe.pdfIn PDF document text
    • https://cdn.sqhk.co/zisiribamen/2gc4ihz/amazon_music_equalizer_settings.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/gem2qGw/69266654860.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_60040b2ba3788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_603966cc6eabe.pdfIn PDF document text
    • http://bitjoms.xyz/41244956855tnq5c.pdfIn PDF document text
    • https://jitedutakawu.weebly.com/uploads/1/3/4/7/134712839/fezutupelozuxasemog.pdfIn PDF document text
    • https://cdn.sqhk.co/sewiboveso/h7qjhgj/clip_tik_tok_video.pdfIn PDF document text
    • https://cdn.sqhk.co/suvezadamut/wQhhtjg/download_game_rusty_memory_survival_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_60351de6c804d.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/2099958.pdfIn PDF document text
    • https://wulilunize.weebly.com/uploads/1/3/1/0/131071037/8367989.pdfIn PDF document text
    • https://mogoribomos.weebly.com/uploads/1/3/4/2/134266362/kurakonuna_dobutekeju_vofejidemifatu_bujomufibok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_6025ea9974ab0.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/iFKgqjj/today_cricket_match_world_cup_live_streaming.pdfIn PDF document text
    • http://meetchat.space/which_of_the_following_is_an_example_of_corporate_social_responsibility73b18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb4557c-afc1-4156-81c1-efa944ec48eb/43840100692.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_274b149a3c4e4f1fb7254d868ed75660.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ef185b-fa5c-4dfe-8665-203091509bf1/what_is_the_central_theme_of_the_cask_of_amontillado.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_a358d5a9b4c8498886b15a6a2602778e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f011900c-03ff-48da-9757-63bd881bf990/xevojukaj.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_b2e82bdf8c654282b9e4fce0a0f99b6c.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_87cee2e29f52419ead10d8ebefc1d8aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed78bd6-1a4a-4819-82d8-0c277ca7058d/22293989624.pdfIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_ff0893d10567446e8ccfb35c4d731690.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 2880 bytes
SHA-256: 619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 5172 bytes
SHA-256: ac4c6e13f3ae96b918eec38bd808171938f2fea1a86166c6bd6a11935c3e67e5
font_02_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 18536 bytes
SHA-256: 7828a08500a8129cacb566a0238550bf3ae1296234481a036e83c1b139c9c2dc
font_03_sfnt_off0001488b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488B 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67