Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce088f84ebc6296f…

MALICIOUS

PDF

69.5 KB Created: 2021-03-22 03:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5e18fbd9b09496082db3d31ba839195e SHA-1: 10d1b0cc0278892b39dc9cb160b0f73a3185a274 SHA-256: ce088f84ebc6296f877f8a2047fe6b342c4dc36f4969f3d00c4bf710699f6698
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a notable heuristic firing for a 'link farm' on disposable hosting, suggesting a deceptive lure. The presence of wkhtmltopdf in the metadata further suggests it may have been generated programmatically for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/123?utm_term=ada+dka+guidelines+2018 PDF link annotation
    • https://rakulemuvi.weebly.com/uploads/1/3/4/5/134506415/kejonanuruwit-lixagoz.pdfIn PDF document text
    • http://gonzo-3d.com/2002_ford_explorer_sport_trac_transmission_fluid_capacityieh20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495839/normal_60393ca91a229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466172/normal_5feb3329c5537.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fe0a6c595e9c.pdfIn PDF document text
    • http://magnetfix.store/the_story_of_channon_rose_2kd6t2.pdfIn PDF document text
    • http://yoga-italy.space/singer_4423_price_in_uaefk59z.pdfIn PDF document text
    • http://slimerecipe.org/penup_share_your_drawingsh44di.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/fexugow.pdfIn PDF document text
    • https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/jawere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb675af-4f37-42c9-be77-7f45c3167f8e/stairway_to_heaven_hawaii_trail_map.pdfIn PDF document text
    • http://xezorepolik.epizy.com/how_to_crate_train_stubborn_dogs.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_214329160fcd4370b075d127856254c2.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_8bf80ebc32b24945a7ff82f749a04ebf.pdf?index=trueIn PDF document text
    • http://wulisuka.epizy.com/anew_ultimate_day_multi_performance_cream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9612142b-1d5a-4f77-a477-0791652d3572/27267776833.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_a187607ccc654542be35665990485646.pdf?index=trueIn 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_off0000d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 5472 bytes
SHA-256: 11456213662e04ac8fd170942e2611bfcd630440f04f409925dee67462b7cad4
font_01_sfnt_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 11128 bytes
SHA-256: 53717148aa3aa498d491e4e1cf989d18665abd2763457ac36cd82181d550a590

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