Malicious PDF — malware analysis report

Static analysis result for SHA-256 faccc4fa3fbfdeb4…

MALICIOUS

PDF

87.9 KB Created: 2021-04-07 07:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: df3b0993da18d05c0a781d0b60cc4e15 SHA-1: c8a7270852f44b8cde39802e626dff0f68682390 SHA-256: faccc4fa3fbfdeb43d67c93b431d2ba4ae5959085d9cd66489f6aadc33f84bab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://dafemum.ru/123?utm_term=proper+deadlift+form+t+nation PDF link annotation
    • https://cdn.sqhk.co/benanejufa/jeDWwjh/52963075645.pdfIn PDF document text
    • http://trylait.pro/how_to_build_a_wordpress_website_in_godaddyaayj8.pdfIn PDF document text
    • https://cdn.sqhk.co/gukomoluda/ygghj0e/vegefazate.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/WKggMgi/free_articles_worksheets_for_grade_3.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/kenmore_air-conditioner_heat_pumpoutside_unit.pdfIn PDF document text
    • http://small-italy.space/black_currant_ice_cream_flavour8kdtm.pdfIn PDF document text
    • https://cdn.sqhk.co/wafepazi/gjc0mie/xerima.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/g0hijjG/33335683428.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://s3.amazonaws.com/nelizenejakarug/biral.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/jebowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46813259-3f66-41bf-b4cd-db223d8ee0f3/why_is_my_ryobi_charger_blinking_red.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/kajolubidopigenexifon.pdfIn PDF document text
    • http://mavuriwowul.myartsonline.com/post_concussion_symptom_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/sobavoxivurogefuvidub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f18190e-da0a-49c4-87b6-a0ef262b5ef4/98462238013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc741682-11a8-4ce5-a0e3-3395e0ef1f6b/94003704074.pdfIn PDF document text
    • http://pajupevezujugut.atwebpages.com/gakususerituri.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_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 4796 bytes
SHA-256: 049644374388f7b2b479732505764898ee56f24d38b8feee63498a41c9ef2552
font_01_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 10660 bytes
SHA-256: 89db7f42d2ced8b46567ec4caac7a4e140f807fde8bb39b43dc8c69eaa663a35
font_02_sfnt_off00014298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14298 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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