Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2fbdbf7d79f102…

MALICIOUS

PDF

80.3 KB Created: 2021-04-04 16:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d0f7dd21f0afc8b79c53edc4b0faaec7 SHA-1: 72e73b8a69bfb46fc298f9650bc770a12168721d SHA-256: 8c2fbdbf7d79f102e9950247d984c59af6240f6a9af02eddb6079b9093336ce0
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://jottigo.ru/123?utm_term=deltran+12+volt+battery+tender+plus+manual PDF link annotation
    • https://cdn.sqhk.co/vovewotutal/KHhhhiT/96099338343.pdfIn PDF document text
    • https://wowuleraregode.weebly.com/uploads/1/3/4/6/134690179/c7d61fd4d9f.pdfIn PDF document text
    • https://tofukoluto.weebly.com/uploads/1/3/0/7/130775982/feranuk_nawavexo.pdfIn PDF document text
    • http://lordtrans.ru/dusideom4d.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/DQ9tvif/dhoom_2_full_movie_download_for_mobile_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_600e8d7687432.pdfIn PDF document text
    • http://micrometerdigital.xyz/68313638264c9mxx.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/jdhePid/easy_earn_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_602c2a2fbd41b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_602eef3e5884d.pdfIn PDF document text
    • http://lynciguest.com/what_is_of_plymouth_plantation_summaryfyy5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5ffe26382af9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_600e257ebf8ef.pdfIn PDF document text
    • https://cdn.sqhk.co/bebofuwe/ifJgghk/72698927689.pdfIn PDF document text
    • https://cdn.sqhk.co/powurejur/heEhakX/zagodefedefanamuzufizuja.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/T0hfvij/weekend_getaways_deals_last_minute.pdfIn PDF document text
    • http://shoop-ff.ru/purolaridefinesekosinuts5cwr.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/mulerux/sobalepabelosemegosewoba.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/how_old_is_misa_amane.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_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 5592 bytes
SHA-256: 42b38448de07006a3b2e0788465947a579ff6528b756860b2f94ebf7704ecc02
font_01_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 10936 bytes
SHA-256: 36c23706c21c2acc40ff40e5ffc35545e05949ff4d6161762242d166c293415b

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