Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1f0ab18737e30f…

MALICIOUS

PDF

83.5 KB Created: 2021-06-02 21:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 81d9c93ed76d9fb010a090a0b3226827 SHA-1: bfc2eb3633818d6ea593610409cef9a137572109 SHA-256: fd1f0ab18737e30faf3fe7821bce580c497be4050134d74726b3fa43ae1a6ee2
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a likely attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, suggesting it might be a generated document used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://philabc.ru/pbw?utm_term=how+do+we+calculate+gpe PDF link annotation
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/8692b308d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_6060a589beb57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_6021e7c18601f.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/794450.pdfIn PDF document text
    • https://xexunejakex.weebly.com/uploads/1/3/4/2/134266262/gazesoz_sizonidigavo_fanodanidado.pdfIn PDF document text
    • https://xuzojawuwakobo.weebly.com/uploads/1/3/4/3/134312069/7473033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_601ba5b9bf799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_605f65981886a.pdfIn PDF document text
    • https://zexorekimapuwip.weebly.com/uploads/1/3/4/7/134702453/1c98524.pdfIn PDF document text
    • https://damenuxorofupob.weebly.com/uploads/1/3/4/7/134711178/1622549.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144466833/can_i_purchase_itunes_gift_card_online.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/w/file/fetch/144423477/varuzutonasediwunufakaj.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/a_letter_about_myself_to_my_teacher_examples.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144483231/71147485253.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/99624481802.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/w/file/fetch/144514353/chapter_2_neil_simon.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144411768/mowivar.pdfIn PDF document text
    • http://nugurafuge.pbworks.com/w/file/fetch/144522000/99143178725.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144488238/lagadebakuxibajuzigom.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/42297063644.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144411492/29035849763.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144520851/why_is_the_light_flashing_on_my_dyson.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/najarokovutoberipus.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144421260/xenejeligujusikugusepa.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_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 5020 bytes
SHA-256: 4a986f72f7ba5a7e78345aea1d32f7262052759e145a841833d9100641435ff8
font_01_sfnt_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 11356 bytes
SHA-256: 15ddf6d896cf168d4d2ea2e353ec82e8d78ef0ad98e0234bd5bf43cfe042e198

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