Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1031800660a727a…

MALICIOUS

PDF

78.9 KB Created: 2021-03-24 17:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c6a77783a05a5e92e0ea6a1da6f81a6 SHA-1: 5308d1639e0756582f9f3a79596cac93ab07dff1 SHA-256: a1031800660a727a91a5dae782da76cc04a55533b9d4832c813689329e608d05
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm, designed to direct users to other sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of external URIs and the ML classifier flagging it as malicious further support this. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=biomechanics+of+sports+and+exercise+3rd+edition+pdf
    • http://fonomujolatuv.22web.org/ccie_and_ccde_evolving_technologies_study_guide.pdf
    • https://sijerixo.weebly.com/uploads/1/3/4/0/134042725/fumivixavut.pdf
    • https://fowidejufato.weebly.com/uploads/1/3/4/5/134582967/mevizalavo_malunezimu_fugipo_bojunile.pdf
    • https://cdn-cms.f-static.net/uploads/4385887/normal_600c8a2821c3f.pdf
    • https://cdn-cms.f-static.net/uploads/4471691/normal_6041b75275ee5.pdf
    • https://cdn-cms.f-static.net/uploads/4451542/normal_6026318b13919.pdf
    • https://cdn-cms.f-static.net/uploads/4428078/normal_600e8cfcafed0.pdf
    • https://cdn-cms.f-static.net/uploads/4486975/normal_604737bcea4d9.pdf
    • http://dezunanerab.iblogger.org/dyson_ball_animal_2_no_suction_from_hose.pdf
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5fdb0c60e2ae7.pdf
    • https://xojemejavema.weebly.com/uploads/1/3/3/9/133987363/bipebofini.pdf
    • https://nuvafuriwevejuf.weebly.com/uploads/1/3/2/8/132814848/3344173.pdf
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5ff4dbb049bbf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://waminakukivexo.rf.gd/dovipalisidimasipetif.pdf
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_fb8699a4f92c4f69b86364ccbc114f59.pdf?index=true
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_fcaf2c761eec4f599d666704bbc4a243.pdf?index=true
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_6d79b5ddd07f45349435ad1f3dcfbf78.pdf?index=true
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_fcc5097b511442eab04843ba4e968159.pdf?index=true
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_16ff71fba90b4efe845abc88f038fca5.pdf?index=true
    • http://zovebosovu.rf.gd/governor_of_poker_2_full_apk_download.pdf
    • http://jibitolokadidus.rf.gd/16129303276.pdf
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_441c6b88e8c446dabb56d28d8dd51e42.pdf?index=true
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_5ca12d32a686474788472c432c31aadc.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b8.bin
d0bec73013984abd7680868949b1c2156e1c9cb766d37b9adb6d8050d57f58aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 5644 bytes
font_01_sfnt_off000108ca.bin
31ee90c67aff030d2bc4d02f914c6fe426cd756016b32afdf9bcbad50d327080		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 10956 bytes

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