Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc32c1f68a7593b…

MALICIOUS

PDF

79.3 KB Created: 2021-03-23 14:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dfe313107465b95c30327e7bda9fe7f SHA-1: 579545f3234fc801d001045672de03db15f24233 SHA-256: 5fc32c1f68a7593b1e7dd872fe4eadd326516a619a05f0bbb8a21e1570f26a06
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with the primary ones being to 'pelibifir.ru' and a Weebly hosted PDF. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or content-luring attack pattern, potentially leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=are+mini+fridges+dangerous
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/wipidamamun.pdf
    • https://cdn.sqhk.co/venifirub/vqjiaie/91937484600.pdf
    • https://cdn.sqhk.co/gabadifofibo/RTiijfj/geluporazerovenifilowavaj.pdf
    • https://cdn.sqhk.co/fasixazijaz/chdD7gg/xoruzuzugufo.pdf
    • https://cdn.sqhk.co/kotolodegag/gjjhpU0/gujurede.pdf
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/6615855.pdf
    • https://sixokibikije.weebly.com/uploads/1/3/1/4/131437702/936dad2b8f541.pdf
    • https://jabasamivesapev.weebly.com/uploads/1/3/4/0/134041177/5055685.pdf
    • https://cdn.sqhk.co/xewafazuk/jcThugf/bukewetulibini.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c8afb70e-ca7b-4040-88c8-5a157e4552c3/ubu_roi_play.pdf
    • https://uploads.strikinglycdn.com/files/8c0245e4-7691-47e1-87de-518af20f8096/keto_diet_plan_for_free.pdf
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_772c690d3b8c4f0898d04e8943a92750.pdf?index=true
    • https://s3.amazonaws.com/xidulumexi/whos_afraid_of_virginia_woolf_themes_and_analysis.pdf
    • https://s3.amazonaws.com/rewepalazamiso/vudixumuvimisis.pdf
    • https://s3.amazonaws.com/tamovagag/rowoligiko.pdf
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_8c56ac5558164c3e8540678fc62592bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/57a80890-37b3-45de-b5ac-ce4bd273e6b5/22436944410.pdf
    • https://uploads.strikinglycdn.com/files/1b1495b6-f8aa-4876-a1d6-a206dec75198/mechanical_quality_engg_jobs_in_pune.pdf
    • https://s3.amazonaws.com/jalasilunaz/full_form_of_mips_school.pdf
    • 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_off0000f85f.bin
b925b9a4ead7fdb09f72638f7d0685206650bf04d503f47f77a1cc70ea4979ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 5184 bytes
font_01_sfnt_off000109ec.bin
698fb4d7d89a6502868cab8523de53d349b5d82ec6266f61df1d441eafe1f4ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 11148 bytes

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