Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4abd9aa4369d90b…

MALICIOUS

PDF

75.5 KB Created: 2021-05-16 20:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f761ed18250a80f1b77f9bcadf3e7c76 SHA-1: d19f2e3c9b27dcac93ca5cf6e3534a3cd53ae100 SHA-256: f4abd9aa4369d90b676345e05aff15dadb7e75e6472e85d4e3b9f1013ecfacdf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the heuristic firings point to the document's primary function being to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://fokemale.ru/strik?utm_term=shakespeare+word+search+pdf PDF link annotation
    • https://cdn.sqhk.co/lagidexetin/ijaqX8G/wood_cutting_service_b_q.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/iggOhjD/ants_life_cycle_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/lhhjffl/stokke_tripp_trapp_chair_baby_set.pdfIn PDF document text
    • https://cdn.sqhk.co/lezenelu/hcvpjdX/perfect_ed_sheeran_piano_chords_letters.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/jhhbCja/digistyle_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/hd3be2h/pomegalajesojezigetut.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/wuleloxivonopavefa.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/Ejcgche/20360912624.pdfIn PDF document text
    • https://cdn.sqhk.co/paxajirawegu/eojciiA/guiding_questions_document_a_henderson_answers.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/gagodenogam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_612079b4ed7b40888e5d4923e990c19c.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_d5066014e07041d4bd180419202d6541.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_e35d46c0da424c4aaf09b2d7740424e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/kizerivedefe.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/kavimigadigilaza.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/how_to_integrate_cosxex.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/zlib1._dll_windows_10_64_bit.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_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 5472 bytes
SHA-256: 728ee47bdecda38c370b3fc79d1b61bd20a8e049ad27073b1182152374be2a94
font_01_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 11708 bytes
SHA-256: 7d6791019e7826ef8ca7162436fc6e381bf84a5b3a06ff7311758430b50f828f

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