Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8aa59b23523769…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 12:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42734bc1cefb362300032fc32f275304 SHA-1: d4f058eeef3ea82fa874b661aaabc463b0b5746c SHA-256: 3c8aa59b23523769a6518a35b403bf4e8f9d7a0f990914ad2f3a364f5e3dd12c
186 Risk Score

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 0.9991

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://maypoin.ru/wix?keyword=westerly+creek+elementary+denver PDF link annotation
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/6838913.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/jdijPhi/nimijabokarov.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/lizisixupupake.pdfIn PDF document text
    • https://mowerezudajam.weebly.com/uploads/1/3/5/9/135966589/2547613.pdfIn PDF document text
    • http://pumesuj.iblogger.org/affectation_rsultat_perte_report__nouveau.pdfIn PDF document text
    • https://cdn.sqhk.co/nubotixuf/Kjeighg/wivixefasitukux.pdfIn PDF document text
    • http://jogubewuzamofet.iblogger.org/who_is_dr_myles_munroe.pdfIn PDF document text
    • https://cdn.sqhk.co/nukebomevobe/giq0Pif/87934123650.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebegawiwa/hjiGYqy/motevene.pdfIn PDF document text
    • https://cdn.sqhk.co/revukone/hhjKMja/lightroom_mobile_profiles.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/b0Ybb8z/boyfriend_plus_size_jeans.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/dgelALP/xexawugulu.pdfIn PDF document text
    • https://cdn.sqhk.co/fetuxudo/hciagi6/bijetagizo.pdfIn PDF document text
    • https://pitisugokusibim.weebly.com/uploads/1/3/4/4/134445344/megub_zamojokosedol.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/jhhh9OA/just_dance_now_apk_mod_money.pdfIn PDF document text
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/8507248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/606c3542-65cc-404f-abf3-99dea3a66007/plantronics_cs530_headset_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0401327d-c185-480b-9a8a-a7c479bf7a40/kugutuduketov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac478a5b-c5ce-481a-acc9-ba7f2de66a69/77565081211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6071d5d7-2519-4fd3-8570-f7ccbc82a38b/34884460523.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/jetolasusifexelesobitak.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/fiwuzikosoni.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/nebraska_furniture_mart_bed_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88361a45-c734-4430-8885-92dcda71b4dd/manage_projects_in_ms_teams.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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 5324 bytes
SHA-256: 5fa281932b249300c1fa0a85e806f15bce5ad330d4ec9162bf2f1831517624d6
font_01_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 11520 bytes
SHA-256: 43f678e5e58bea3c7f594ca6cb908acc8b096bed19d923b80dcc80aa3062d89b