Malicious PDF — malware analysis report

Static analysis result for SHA-256 3435d7cc584c60a3…

MALICIOUS

PDF

74.4 KB Created: 2021-02-28 05:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 703de6ef55e138936c1709279aac3a1b SHA-1: 33c2d94f48758f31d5758020799794e90cfd071a SHA-256: 3435d7cc584c60a3cc3d34b60da9431b9798b429c43561993dfb573df381e7e1
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-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://soxebez.ru/aws?utm_term=intermediate+algebra+problems+aops PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448113/normal_602c741ca7c83.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/hajblSB/25467048009.pdfIn PDF document text
    • http://myyshooop224.site/sigawilumexovajodabubnqed5.pdfIn PDF document text
    • http://heleogose.online/what_does_call_to_action_mean_in_a_speechjhl9q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5ffb7a806f6ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_6037c0234d7ce.pdfIn PDF document text
    • https://tokoposejod.weebly.com/uploads/1/3/1/3/131380771/9bed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466146/normal_60340a09d298a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5fd7dcd0cbd60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420776/normal_60006bbb735ef.pdfIn PDF document text
    • http://cozyplacefor.rest/nujozorezexipedujetxiynz.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/bihjd1Z/quest_diagnostics_portal_360.pdfIn PDF document text
    • http://alifan.store/solicitud_printaform9xur7.pdfIn PDF document text
    • https://cdn.sqhk.co/xakutofi/ciggfNb/toon_blast_champions_league_stage_13.pdfIn PDF document text
    • https://cdn.sqhk.co/baxilutifi/iiehiji/hp_smart_app_download_windows_10_without_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_5fea39a0dfafd.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/eEbgdvj/47936878501.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/bf2e041326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 5356 bytes
SHA-256: 528b05041bc3ca75f0b57debefce06f55f8d51cdebc22412a5cf3f02a28eaf56
font_01_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 11248 bytes
SHA-256: 45c89a2bd1d47d9de4dfcec87b6c478e7c75b1be9ab2dfa275abab638c0171c6

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