Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a860473e55a49b6…

MALICIOUS

PDF

92.9 KB Created: 2021-06-08 20:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dbb0b230e9587b8c43af3aeb1e0e8ffe SHA-1: 993b735b36a91458d1785544c1f6cfe2a0337206 SHA-256: 7a860473e55a49b69d87a82445bb3ddac947f77f6ae7ddd4a3137281ae9e3b76
186 Risk Score

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 0.9997

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://coretry.ru/pbw?utm_term=best+coc+th10 PDF link annotation
    • https://renugukid.weebly.com/uploads/1/3/0/9/130969315/sotogakidadawopufe.pdfIn PDF document text
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/1436902.pdfIn PDF document text
    • https://gutalekosipotix.weebly.com/uploads/1/3/4/3/134351461/gevumeze.pdfIn PDF document text
    • https://gesoroserazam.weebly.com/uploads/1/3/4/3/134310447/raxad.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/7132103.pdfIn PDF document text
    • https://femodufawo.weebly.com/uploads/1/3/4/3/134317846/afe19c.pdfIn PDF document text
    • https://fibavizenimi.weebly.com/uploads/1/3/4/4/134485548/mafenurufidafu_bapenukejumiso_buxevogaborene.pdfIn PDF document text
    • https://dibugovag.weebly.com/uploads/1/3/4/7/134710264/2266776.pdfIn PDF document text
    • https://pegepefip.weebly.com/uploads/1/3/4/4/134455730/zutexixawa-palegiweluleluk-kumadolibomifu.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
    • http://fudejob.pbworks.com/w/file/fetch/144528831/faxosejel.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144420771/22134004161.pdfIn PDF document text
    • http://dupalalo.pbworks.com/w/file/fetch/144728811/dragon_ball_z_vs_naruto_mugen_tournament_apk_download.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/f/shadow_fight_2_unblocked_games.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/apple_watch_series_5_44mm_cellular_price_in_canada.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/38952083784.pdfIn PDF document text
    • http://gaguwufajij.pbworks.com/w/file/fetch/144875391/fallout_shelter_mod_unlimited_money__50____Low__0.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/31230569069.pdfIn PDF document text
    • http://pidexuxok.pbworks.com/w/file/fetch/144583791/xalomuguge.pdfIn PDF document text
    • http://vomuseteweto.pbworks.com/f/54186916970.pdfIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144536052/fajesibarolu.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_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 4424 bytes
SHA-256: aaff355133436c09debf9dac391b6eaed31135c6e0ce2dc95bd8ca1b273fecfa
font_01_sfnt_off000131fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FE 11168 bytes
SHA-256: 4630a2a5c0bb03c613d2b44c3bb1b52e25253b582e9b1e711879e93e797b6c3a
font_02_sfnt_off00015808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15808 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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