Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69b4c7bd6d8ff3d…

MALICIOUS

PDF

66.0 KB Created: 2021-02-24 06:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c6116a37f09dc3b365ffc58a556d1df9 SHA-1: ec52db04495d0011a7fd4d38368f177acd1459da SHA-256: e69b4c7bd6d8ff3d7c38f9fa7aa0b962992e081be1faf71227f8f6a2d4bdf3bb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm point towards an attempt to lure users to malicious sites.

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://bologen.ru/123?utm_term=learn+to+draw+caricatures+alex+hughes+pdf PDF link annotation
    • http://summ-green.fun/183707823568ih1t.pdfIn PDF document text
    • http://meetcabinets.xyz/wazukorevubanetusaz65kec.pdfIn PDF document text
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/sifofetov.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/5vgipdz/xijotudituxo.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/Oggctjj/download_game_guns_and_spurs_2_mod.pdfIn PDF document text
    • https://giboritozi.weebly.com/uploads/1/3/1/3/131379296/a368e49782.pdfIn PDF document text
    • https://bufumuwo.weebly.com/uploads/1/3/1/3/131398085/4a3754ac3d.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/rawixurir-lekodipugega.pdfIn PDF document text
    • https://jovuximunises.weebly.com/uploads/1/3/0/8/130814448/e4495f0baf.pdfIn PDF document text
    • https://rasizuxuner.weebly.com/uploads/1/3/1/3/131378923/rugirolodesow.pdfIn PDF document text
    • https://zurirepazigotot.weebly.com/uploads/1/3/0/9/130969164/forasif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://texazelezawo.rf.gd/salon_fundamentals_cosmetology_exam_prep.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/how_to_parent_a_child_with_intermittent_explosive_disorder.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/dashboard_templates_angular_4.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_off0000c45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45F 5520 bytes
SHA-256: f53b13650ca3552c9cead9451320d0a6a8608c3a5364b09b66c2005dc1720cda
font_01_sfnt_off0000d73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 10588 bytes
SHA-256: 399e767a5b6dd9f5466095cc864e6a37e0488079d94f3b624ea1071031de7c9f

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