Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f0dbd47a57fd79…

MALICIOUS

PDF

72.4 KB Created: 2021-02-07 04:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6f405863c40af6c7aa0292f97471d062 SHA-1: 99d54e3405b5cff97b8a29252288203d27d6c441 SHA-256: 80f0dbd47a57fd79a2703d6a5d6958f1d1b0b2b145a8cc3fff407c6a1335a1cd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it is designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=ancient+athens+economy PDF link annotation
    • https://fodolirikixubug.weebly.com/uploads/1/3/5/2/135297927/968447ac93830.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/fawisulaxafat-rinedafasizak-wewir-xodajipebapituv.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/4dd0364255.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/vosikurum_pemodun_mebiseraxe.pdfIn PDF document text
    • https://vetafewilede.weebly.com/uploads/1/3/1/4/131408572/befivuvenuna.pdfIn PDF document text
    • https://zujamabosav.weebly.com/uploads/1/3/4/3/134363941/3691603.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/bMiajgS/hoverboard_injuries_2018.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/9178c0061db9724.pdfIn PDF document text
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/xebopi.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/ruxemovinududopuwum.pdfIn PDF document text
    • https://dapadode.weebly.com/uploads/1/3/4/6/134646205/baresenuzuzu.pdfIn PDF document text
    • https://malugeko.weebly.com/uploads/1/3/1/6/131636988/jarotope-lurumevuzoz-setisoro.pdfIn PDF document text
    • https://cdn.sqhk.co/zaxuloxedu/P3AgiE4/werewolf_wallpaper_app.pdfIn PDF document text
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/b5ddd9f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/minecraft_tlauncher_1._8._8.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/69685039030.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/delete_cookies_chrome_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/65164067060.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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 5004 bytes
SHA-256: 52befe31c0292b878f6aed5054bba22b87bca1ebd982242df6c99cdbf273d34e
font_01_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 11156 bytes
SHA-256: 3e7dc582e80d1632faf2cd4578b11e6787ce361a29e2e873e603dddb8092e65f

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