Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0b4617e71216e2…

MALICIOUS

PDF

74.3 KB Created: 2021-02-27 01:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 28f0fc483cbf53f7f89ba63eb1b06b0d SHA-1: 51cfa721a431e2f22d8673a244731fdd3d80082a SHA-256: 8f0b4617e71216e2c3aebda965228b1ea6b8c00b5aa58cb39f074d93eb9f2a21
126 Risk Score

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 0.9998

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=salary+of+medical+microbiologist+in+canada PDF link annotation
    • http://womenita.fun/consumer_reports_login_trackid_sp-_006zdlob.pdfIn PDF document text
    • http://stal-kemerovo.ru/81774168859k5lmq.pdfIn PDF document text
    • http://autocredit.moscow/59430148920ea5p2.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/hf8hi81/32640029318.pdfIn PDF document text
    • http://differencecheats.net/ak_nbeti_indirjtgze.pdfIn PDF document text
    • http://interbank.link/cabala_para_principiantes_gratishdsvl.pdfIn PDF document text
    • http://trokot-roznica.xyz/vidikovanoxugevabyn6mk.pdfIn PDF document text
    • http://tikovg.xyz/3363299261aavts.pdfIn PDF document text
    • http://handler-autoscout24.com/53259325099diipc.pdfIn PDF document text
    • http://options.expert/80347752678lv1lt.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/4ihRwS9/30230097797.pdfIn PDF document text
    • http://vinorama.fun/fedex_express_freight_us_airbillp7qsf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunonam.atwebpages.com/78676635986.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_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 5684 bytes
SHA-256: 80145c5b76209d64446d37ebec8d97dc5dd6a891b8323c08c7c3e2d810495ece
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 11184 bytes
SHA-256: 098985cbe332cf55be09bb108eed8b26665634953e9d736e69dc3036351817f8

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