Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bbe0fadbc0e25d…

MALICIOUS

PDF

74.3 KB Created: 2021-06-13 18:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 731caab36f33ba8728d3a5752ffadd5a SHA-1: 5440a4697ee33a2c18507a837897924c2a64361c SHA-256: e8bbe0fadbc0e25dc3f0314f8b5b335468d96867086260a7e0004866a292e1fb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'queure.ru', which is likely a phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to attract traffic, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://queure.ru/pbw?utm_term=4+times+table+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494648/normal_5fca0596514a5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4530578/normal_60b1afa91284f.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://pojaweku.pbworks.com/f/fake_boarding_pass_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6799dacd-c9c4-4e50-a793-3277e56465a9/is_acer_a_good_computer_company.pdfIn PDF document text
    • http://watusuxipidu.pbworks.com/w/file/fetch/144424161/how_much_does_a_medical_research_analyst_make.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144416781/cheat_crystal_marvel_future_fight.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/movie_credits_template_premiere_pro.pdfIn PDF document text
    • http://rubuxesi.pbworks.com/f/mibesagobudotebutata.pdfIn PDF document text
    • http://xumamiz.pbworks.com/f/how_to_get_to_safari_zone_heartgold.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3549515b-d941-4b70-8872-cc95b2ed3488/53703727224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ccd9bd-8753-4ecc-921a-d0fcf101d484/31022920244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdee4bf-4b3e-4b4e-9115-ee65eb907b7a/jojelixanobuzifanutexiwud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eced952e-f8c5-46b8-8185-20c5cb10a615/stihl_grass_trimmer_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fa919f-4518-43dd-bc0a-fceb5243b77a/sojipi.pdfIn PDF document text
    • http://zafasuvolo.pbworks.com/w/file/fetch/144623514/59361430157.pdfIn PDF document text
    • http://xawasesofe.pbworks.com/w/file/fetch/144876006/lomojakojek.pdfIn PDF document text
    • http://jopamedet.pbworks.com/f/salis.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/space_engineers_best_xbox_mods.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/145238892/pf_claim_form_10c_download.pdfIn PDF document text
    • http://demopefo.pbworks.com/f/38952127811.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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 5252 bytes
SHA-256: 5901119f22915e1f6d4750c374752afcafb73b23b35ce2a1545bd59f8c82fc4b
font_01_sfnt_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 10432 bytes
SHA-256: db2c867cee489518e55ebe1a54bc1152504be1c5bea64a04299e591d6faee1fc
font_02_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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