Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6135332a0e61cc3…

MALICIOUS

PDF

74.9 KB Created: 2021-02-24 03:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6ea5fcbeb7bdd9f73004527fb8260212 SHA-1: 92d1fc93560b66b15ff8d4142bff8926718e262f SHA-256: d6135332a0e61cc31a442eea073bf765d24effa57dfe547a4dbf2ed2456e1256
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 0.9998

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://jottigo.ru/wix?keyword=wwe+supercard+hack+2019+no+human+verification PDF link annotation
    • https://voxuvuru.weebly.com/uploads/1/3/5/3/135390020/mifufodad-wasefovipidel.pdfIn PDF document text
    • http://easy-money-cash.space/atziri_fight_guide9amla.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/dZ2TdkZ/smashing_four_wiki.pdfIn PDF document text
    • https://wobikuneli.weebly.com/uploads/1/3/2/7/132741052/fde479de6560.pdfIn PDF document text
    • http://arnautmebel.ru/2126981849992j2u.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/ijF0jgg/61184053498.pdfIn PDF document text
    • https://cdn.sqhk.co/mogilirexexa/ggifjfm/9th_class_admission_form_2019-_20.pdfIn PDF document text
    • https://tiwixuferexo.weebly.com/uploads/1/3/1/3/131380596/rewulefizogi.pdfIn PDF document text
    • https://lekamenofujilap.weebly.com/uploads/1/3/4/6/134690267/mupifipugise-wifaxiv-tisomebi.pdfIn PDF document text
    • http://b0xberry.online/poximav0f4gh.pdfIn PDF document text
    • https://vuvudosav.weebly.com/uploads/1/3/4/5/134579130/254ed3.pdfIn PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/d5ac9c.pdfIn PDF document text
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/dirubuvugoj_siroguru_rorukufaretuk.pdfIn PDF document text
    • https://cdn.sqhk.co/funuwovo/hjBajaU/alien_zone_raid_mod_apk_latest.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabovabavuwemet.rf.gd/86993266961.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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 6076 bytes
SHA-256: 78a82d534f6d63c3620e92b35c650b4f10db937fd625bcab5dd5197f6f2daba4
font_01_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 10136 bytes
SHA-256: 4f938a1a5c2b1b300935874e00ff6c0f2e548f05abbe4af0287d6e30d2a3299e

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