Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aaf86a9aa69830c…

MALICIOUS

PDF

78.1 KB Created: 2021-04-18 16:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8b996f11105681909dd2f2668fc6758f SHA-1: b18e018995150263bdc888bd917f3e84806a43a6 SHA-256: 3aaf86a9aa69830c721522783dd5a5de3e51327310800aee10f2b6d1897680ba
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://ponafet.ru/strik?utm_term=what+groups+were+part+of+the+second+estate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497344/normal_6035f3a47d543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501998/normal_5ffb2cacdc90b.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/hSlzhiK/gorillas_in_the_wild_documentary.pdfIn PDF document text
    • http://muzoc.xyz/37501785585gcmkf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_603aa82735b50.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/0Kjjjep/fm_2018_goalkeeper_wonderkids.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405945/normal_5fe0a6bc42608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_606e9e465cae5.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/iaEuNGq/juparajikijepif.pdfIn PDF document text
    • https://kilizalulalikog.weebly.com/uploads/1/3/0/9/130969980/netazizumix-zegamigitudi.pdfIn PDF document text
    • http://dombitarf.ru/how_do_i_stop_my_kidde_smoke_and_carbon_monoxide_alarm_from_beeping3yokp.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/zizubinabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5fda862f7c7c9.pdfIn PDF document text
    • https://cdn.sqhk.co/rawavuzom/hibAidu/28007264858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_604cc595282a6.pdfIn PDF document text
    • http://help-nanny.site/how_to_change_braun_ear_thermometer_from_f_to_cdl3z9.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/73hba0j/carnival_cruise_lines_stock_price_history.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_21e0a6ce09504e44b2e12675cbbb251c.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_5d10656f12c64f9b8004b092372b587b.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 5492 bytes
SHA-256: 7e361725573409df675705ffb43e441966003852545919c3c6f681ec6a467d5c
font_01_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 11232 bytes
SHA-256: 0161a8f4ef89b73ed37876acccfae052f8007a8af1454d85c08b5a7807d8b57d

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