Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a656e7551f44ff3…

MALICIOUS

PDF

71.6 KB Created: 2021-04-03 10:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 76d24c250c1aaac277cda0ef3fd00f51 SHA-1: 52573d85a6a4ae875419980c4549d36a986b0f5f SHA-256: 9a656e7551f44ff35d7ae82f10a7e2216a71cd06c882e00b436b0c79131e673a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/strik?utm_term=asus+q502l+battery PDF link annotation
    • https://cdn.sqhk.co/kerutadit/7qJ9gh3/komuvelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_603f770314174.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/diijjhb/clash_of_three_kingdoms_gold_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/vovawumusa/LtAdnje/85148491083.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/igi6hgo/awm_gun_sound_message_tone_download_mp3.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/lapuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/geiehbP/iphone_x_lock_screen_wallpaper_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fidakasari/iVfBgfp/39643142722.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/xiwusidefo_kusisok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5ff8b99f13161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_6022062fa03bd.pdfIn PDF document text
    • https://dizarikovir.weebly.com/uploads/1/3/4/6/134627165/9950017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5fe27bcc81cec.pdfIn PDF document text
    • https://cdn.sqhk.co/gonuromabime/bjjiif9/jusaworimebugeluzajiluje.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/06f91804-2615-4713-a6df-bef0a74c5180/88403300594.pdfIn PDF document text
    • http://wurozuvejesubot.epizy.com/58010383581.pdfIn PDF document text
    • http://jumejivoreka.rf.gd/lunamag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8522cd6-fdcd-4f59-84bb-9103747e5821/the_blind_assassin_page_count.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f6c999-c07a-4c92-bb7a-ccc1089c36f9/gepegafekewosavofejigike.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 5436 bytes
SHA-256: 6f1fb4652270c573ffda85b8cf147ea64e80cc0431a8f9f6fa4098037bf5f45c
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10760 bytes
SHA-256: feec8d799649c9d83af40a6518e109ff207a7f41fd58c5ee6210d853a02dcde8

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