Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8a337054634c20…

MALICIOUS

PDF

77.2 KB Created: 2021-03-07 11:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 39e6ffc416c31f414ce5e3b4c238e4db SHA-1: b0aa14a09587b5e37b078d0654899cff9495a770 SHA-256: 8e8a337054634c20a737048872da61a0ff2baa1b3de91493531a86f88d1da9d4
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=hp+84a6+motherboard+specifications PDF link annotation
    • https://cdn.sqhk.co/linidivez/hejaB57/autotrader_used_cars_and_trucks.pdfIn PDF document text
    • http://nevozepamuj.iblogger.org/45450826605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413575/normal_600dc47b8f5f8.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/9PjaFjc/loopback_ip_address_means.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fd5f323ad311.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/hcihfgj/diablo_t1000_tuner_update.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390659/normal_6006a11014768.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/jaZjhsP/calculate_percentage_difference_between_two_numbers_c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fe09a32a2ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_601afeeab3737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6014e4b95eb39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385620/normal_5ff471f70d86a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470228/normal_603e2ea28e420.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://sizixezaratog.rf.gd/vebesuxozomuvolefe.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/tonivelijuzawupa.pdfIn PDF document text
    • http://saduxax.epizy.com/dimagezabuzuwut.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/5594223310.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/how_do_i_pair_my_jlab_wireless_headphones.pdfIn PDF document text
    • http://mutelikatiseza.rf.gd/half_life_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/10786979643.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_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 5688 bytes
SHA-256: aaacdf817592054ba2b07e7fc01665f6df2a97525bc641733af251f5d2404ca8
font_01_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 10548 bytes
SHA-256: cdc950ce5fc3896a38d9287e27e7c29b014647b93b6175e53a570e4ef0ee0ae3
font_02_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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