Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e44b28d4eb8619…

MALICIOUS

PDF

81.7 KB Created: 2021-03-20 12:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 314df543b88d4a365aa77c8e490512ba SHA-1: 55864bd55af8079bd0d0fb1f517cd14f8d494d7a SHA-256: 42e44b28d4eb8619e9370f6b4a6d8363eb12a0f313e934763934ae9f14fc1018
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

Heuristics 5

  • 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 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://leonvi.ru/award?keyword=dresden+files+rpg+our+world+pdf PDF link annotation
    • http://instapriz24.site/denibetonase9nnqb.pdfIn PDF document text
    • http://profmaster74.ru/94954414058stbxf.pdfIn PDF document text
    • http://teren.fun/84912233433e38eg.pdfIn PDF document text
    • http://canlisohbetim.net/novalododv9em.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/nnEhcAm/movie_quiz_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/r7BWWhg/bijepodomuva.pdfIn PDF document text
    • http://50offshop.info/videoder_for_pc_windows_7_frees87i0.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/ijljija/nulizapuvodubojalopotox.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/gN6qUuW/gipifevof.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/icj116v/xonotamizirosomevurinudod.pdfIn PDF document text
    • http://tezosomebapixim.22web.org/82188861380.pdfIn PDF document text
    • https://cdn.sqhk.co/naxudufejik/bSpjfSP/fruit_hunter_ninja_3d_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/XNHgjM2/radadanobibogimasop.pdfIn PDF document text
    • http://ragitikevuwa.22web.org/2019_bollywood_movies_sites.pdfIn PDF document text
    • http://kdghy.online/kemekolg6ri.pdfIn PDF document text
    • https://cdn.sqhk.co/bawivurolut/jbiaAid/jojasuxunixa.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/jjjbgiy/luxof.pdfIn PDF document text
    • https://cdn.sqhk.co/ripejiku/UJzhdjj/oxford_learner_english_dictionary.pdfIn PDF document text
    • http://neojust.ru/gesudatijek2di0f.pdfIn PDF document text
    • https://cdn.sqhk.co/nizaveni/hZcwngg/soccer_championship_2019_live.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
    • http://sadigibesalij.epizy.com/geometric_reflections_worksheet.pdfIn PDF document text
    • http://fokibuzevurir.rf.gd/27550468612.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_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 4892 bytes
SHA-256: 4721dadb463cbf6d07a1cf41c6488224fc6e92b927598687923bec6cd7890e61
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 11236 bytes
SHA-256: aac68ef16c5c030612b7feec790f3440b222b651f8b42e304d8ec3db21a87f1b
font_02_sfnt_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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