Malicious PDF — malware analysis report

Static analysis result for SHA-256 f879a2227e4ef2f9…

MALICIOUS

PDF

80.0 KB Created: 2021-03-14 12:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e2ae2f5ece820497f752320acb4ee605 SHA-1: b6e11ba5b74a62b902d9ecfa748a4ce047ab632c SHA-256: f879a2227e4ef2f9839acf32133a86d8cdc9f5e78d01435d154b8cc7c6b10d51
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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=honda+transmission+fluid+change PDF link annotation
    • https://rezalebivug.weebly.com/uploads/1/3/0/9/130969918/7e64568bcf985.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/eJJsYii/94830898451.pdfIn PDF document text
    • https://cdn.sqhk.co/febutatesu/FgcOSW2/36169977267.pdfIn PDF document text
    • https://kemewekodu.weebly.com/uploads/1/3/1/8/131857474/rejibutowowaxid.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/tixezudi-pozomabajiw-gomodujisofo.pdfIn PDF document text
    • http://zarabatyivat.ru/introduction_to_machine_learning_with_python_andreas_muellernpsi0.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwapusumoge/BgfxhfW/83262000401.pdfIn PDF document text
    • http://copyrightram.net/2005_xc90_repair_manualzya6x.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/dQxidic/my_lottery_dream_home_episode_59.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/ibS6rOH/lubuvuvupaxuvonifelijeg.pdfIn PDF document text
    • https://cdn.sqhk.co/xifobariw/2qUOher/ey_breakfast_briefing.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/cThijeb/environmental_scientist_or_specialist_jobs_near_me.pdfIn PDF document text
    • https://tojoniwov.weebly.com/uploads/1/3/4/6/134602819/koligazitetof.pdfIn PDF document text
    • https://cdn.sqhk.co/gumakulex/dZ2yzja/5865108235.pdfIn PDF document text
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/dirulimiputefuw.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/ehboZ08/91181759980.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/jjSi1hj/orbt_xl.pdfIn PDF document text
    • https://cdn.sqhk.co/gejikofoxaf/jfjh04J/android_ios_market_share_by_country.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/wordscapes_level_8056sy09o.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/kakekojezutok/communism_and_capitalism.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/caseys_application.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/68667868879.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/lubomipofivakovewo.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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 5276 bytes
SHA-256: e685bdcfa5ef18f8b8b65464d182782bbe6e0acfe3b6ebdc8a1e96e0e03397f7
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 11132 bytes
SHA-256: 7d4c6f3eda2d8458ded6766e6053723d4c3c72b3efbb5154a9465d755356a189
font_02_sfnt_off0001248b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2