Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c849a4baf792d11…

MALICIOUS

PDF

79.8 KB Created: 2021-03-17 16:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2e2df7e900e16e53ddf82523f86d1592 SHA-1: 4621038ab6c29444ccbbfc185192ca25e25ec837 SHA-256: 4c849a4baf792d11af229dd2d94136d4d0fd40ac0f6074fcd58fe30cdbd6b274
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm intended to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to leverage SEO tactics for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/strik?utm_term=lyman+d7+precision+reloading+scale PDF link annotation
    • https://cdn.sqhk.co/zopizote/cbdv4gd/photo_blender_dslr_cameras.pdfIn PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/sevejamofoxun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fe0fdcdb93fb.pdfIn PDF document text
    • https://xijitivagafe.weebly.com/uploads/1/3/4/7/134709267/6028908.pdfIn PDF document text
    • http://midimox.getenjoyment.net/kogosiwogosinopewu.pdfIn PDF document text
    • http://paxabak.mypressonline.com/36105360805.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379487/normal_60063f09cc888.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/dgcjcPu/xomapur.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/6sjjhas/8753083794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449600/normal_5ff671250d3fb.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/nnwihed/download_toca_boca_hair_salon_2_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_60395d647dfbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_60364d16820a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8f6f57e9-4cde-4613-a18a-8aad41ceae7d/38884644765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdb76e1-0aa4-4c24-90a8-c4e99e77e7a3/35258323856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab08c69-dbb3-4f90-9495-d41fda12ceb7/jufofinegusipale.pdfIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_4703b0b242ff4377a26bbbaa7588f679.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_5819df2efda64035a5987fa26e267669.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e51be1-c0ed-4b6f-abbd-0176f0524d94/how_to_download_minecraft_windows_10_edition_for_free_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9d2d5b-3208-4713-9d7e-44b04c4eebda/kaxixa.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/big_bang_theory_universe.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 5224 bytes
SHA-256: 4c6f4e9038f29a1c7b2671a2408c9fb08bf6b2fe91156232b459d1f0062ba188
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 11164 bytes
SHA-256: 70cf52160e8a5a5c3212603c0dced5a48b5796e84d0f7ff04300503aaa6976ca
font_02_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176