Malicious PDF — malware analysis report

Static analysis result for SHA-256 c533810677380d9d…

MALICIOUS

PDF

72.1 KB Created: 2021-03-15 23:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0721bfaf4b13037094d1d035a8065bc7 SHA-1: dcbd67186ef3afb98c3715a5f8d8eb4f86e31a57 SHA-256: c533810677380d9d1da8ea7624d6ed39261a9098982881e35d77e242f05520db
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malicious intent. The heuristic PDF_SEO_LINK_FARM firing suggests the document contains a large number of external links, likely to manipulate search engine results or redirect users to malicious sites. The embedded URL points to a domain associated with link farming, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=coleman+powermate+generator+3500
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5ff3f3b135ab2.pdf
    • https://static.s123-cdn-static.com/uploads/4382209/normal_5fc6826bec8b6.pdf
    • https://cdn-cms.f-static.net/uploads/4484618/normal_604dd0bf8b53d.pdf
    • https://cdn-cms.f-static.net/uploads/4421200/normal_604d9568cc91e.pdf
    • https://cdn-cms.f-static.net/uploads/4495974/normal_60302e021f67e.pdf
    • https://cdn-cms.f-static.net/uploads/4480393/normal_601c700cd2e87.pdf
    • https://cdn-cms.f-static.net/uploads/4448538/normal_60172b57f3aaa.pdf
    • https://cdn-cms.f-static.net/uploads/4380403/normal_603e670cd3c9f.pdf
    • https://cdn-cms.f-static.net/uploads/4490375/normal_602ef1ae97556.pdf
    • https://static.s123-cdn-static.com/uploads/4444114/normal_5fca9ecb8354d.pdf
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fd34cfe3aaae.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_6044a6334c771.pdf
    • https://cdn-cms.f-static.net/uploads/4404523/normal_603b9a2a538ef.pdf
    • https://cdn-cms.f-static.net/uploads/4454971/normal_60150dcbbafcb.pdf
    • https://static.s123-cdn-static.com/uploads/4367617/normal_6002774b75d30.pdf
    • https://static.s123-cdn-static.com/uploads/4415935/normal_6003e77a2cacb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/abffe2fc-77b0-4892-b313-9a62759a47aa/mawawelaxedosesot.pdf
    • https://uploads.strikinglycdn.com/files/ab4e536a-cf38-4fbc-8262-b41b5c2c30ba/how_long_to_learn_barre_chords.pdf
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_0b8580a4963043c59f0edcf996a891d6.pdf?index=true
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_d0de2b7f94a346f69e5222ae16e01061.pdf?index=true
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_c530e5b1472c4939ab9d80ea09f7c7af.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dc0596cb-cd1e-4da4-94b6-2aec5eb0d817/12627433075.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_bca7bee849ec45eb93f1e1a031fb6e12.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6878a145-c872-4926-928f-050e96d99f47/jewuvibuzuzide.pdf
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_7107cf5f62254694a92b67724775d669.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_off0000da86.bin
0b6c868a81eaca5df73a6a1ed87978e828567d85a28aaf90804d188da6ca19d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 5388 bytes
font_01_sfnt_off0000ecd8.bin
6e40a58353861ea022d2a64eb5f4ffd85f9164ec38d703015d0befa26a5b84bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 10716 bytes

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