Malicious PDF — malware analysis report

Static analysis result for SHA-256 09442b5028c76071…

MALICIOUS

PDF

82.5 KB Created: 2021-03-14 05:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 522081c7aa1632574e26e4b4eec5c308 SHA-1: 6f4f898520329f05f6a7c0d314d583b3e74d9347 SHA-256: 09442b5028c76071f7394a8a8e4c2cbbe40caca22d44e079b495646e0ac46291
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document functions as a link farm, hosting numerous URLs on disposable domains, with one specific URL identified as a malicious redirector. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or spam distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=the+monkees+i%2527m+a+believer+ukulele+chords In PDF document text
    • https://cdn.sqhk.co/lowixadoges/lie3WpL/missing_you_quotes_for_him.pdfIn PDF document text
    • https://cdn.sqhk.co/litojavu/Xhh9hfI/umc_covid_testing.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/14233205808.pdfIn PDF document text
    • http://beruvutekimeged.22web.org/18323386691.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/35070536297.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/WhaC9gc/planet_waves_tuners_locking.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/jovekijuxabured.pdfIn PDF document text
    • http://momarivido.mypressonline.com/autumn_leaves_trumpet_chet_baker.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
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_97ac003ce88b4d88b4d275f02db86f0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44708ff-d248-43d2-af3e-2b7ff846631e/42284299525.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/38687497190.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/best_knot_for_braided_fishing_line_to_swivel.pdfIn PDF document text
    • http://wuriwafu.epizy.com/2241460528.pdfIn PDF document text
    • http://xexelakufakeze.epizy.com/worksheet_playground_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/51046097715.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/what_is_the_difference_between_a_promissory_note_and_a_bill_of_exchange.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01341f5e-71e7-4f6f-bd63-eaeee83ec6d6/kaderat.pdfIn PDF document text
    • http://divojeniro.epizy.com/92738352819.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_03f2c64fb4e349e49a051376da630f61.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_795cca1c1eed44918454d85f3073097d.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_c13e3ec1b3c541d0a44107f51d50b5ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitok/riweguw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c307785f-7bf6-4012-bf63-44808fea62dc/90220127360.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/68006262675.pdfIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_b699f935db0e4625bb7d45cc7deaf03b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc34424-cd63-4379-891d-f7f3208befae/17116515790.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_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 5228 bytes
SHA-256: ed59c31ef6ff2b882224324680830fcd002ba1b88371b10b0cedf3f2ed03763a
font_01_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 11516 bytes
SHA-256: 5af0316cbc6db511a0aa6cc2f18ac6fb9ad214cd4e2e0d55f9ff4d287fc9fb00
font_02_sfnt_off00012c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C35 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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