Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ae93791564653e…

MALICIOUS

PDF

79.8 KB Created: 2021-03-17 14:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea874bbfd350b07f8e198623f7c0ad08 SHA-1: 5f5fb638ead7650cd77bc0ee945908a70897b001 SHA-256: 42ae93791564653e640f2febb377c05186b148dd4297a8653d3e63d07b6e0cf3
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 0.9998

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://xezojetit.ru/strik?utm_term=asio+core+audio+drivers+download+mac PDF link annotation
    • http://zixaxagewan.mypressonline.com/how_to_connect_bluetooth_on_pioneer_mixtrax.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/TujfdiF/muxilujutujosejelirumum.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/zadojifuxuboxixedopo.pdfIn PDF document text
    • http://ecoservice-vlad.ru/the_new_leaders_100-day_action_planjtq6o.pdfIn PDF document text
    • http://lidzadva.xyz/clash_royale_gems_hack_apk25nxt.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/974ab2ac3d031.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/sJhfghZ/68644179449.pdfIn PDF document text
    • http://simultaneously.space/dragon_king_clash_of_clansrujej.pdfIn PDF document text
    • https://xurugafidas.weebly.com/uploads/1/3/6/0/136081795/nufulevifo.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/t2JhcA1/75022094231.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/aggjcha/xerironuzig.pdfIn PDF document text
    • http://erethiztzj.space/1854961631gr46v.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/32dNJxs/25437110636.pdfIn PDF document text
    • https://cdn.sqhk.co/sakixowofeg/0hdiCu0/scrutinizers_report_for_e-_voting.pdfIn PDF document text
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/dupubewuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/gcjaghM/velodrome_track_length.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xogijowag.onlinewebshop.net/74630504951.pdfIn PDF document text
    • http://rilevoka.rf.gd/simplehuman_soap_dispenser_troubleshooting_red_light.pdfIn PDF document text
    • http://nogigekeweragu.rf.gd/zadexuseji.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_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 5224 bytes
SHA-256: 4908a4d436b9745c2e7af9c23bb49d4f3ebc4eea8a833c03fb2f3601c3b313ff
font_01_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 10764 bytes
SHA-256: c2a942f5b02b7e723268420d37c38ab23c2fa769f3dfb2d80176e10d171f3386

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