Malicious PDF — malware analysis report

Static analysis result for SHA-256 5748735cb33606d0…

MALICIOUS

PDF

86.0 KB Created: 2021-05-06 06:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 01278a0bdaf471b1b6cb174f848a11f3 SHA-1: 22a29e48f00f21a1bd7f97ee4a66f6c4c20be839 SHA-256: 5748735cb33606d0bd04715e3fe3d4b01210af15971203412e61c7361b4a752d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with one prominent malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect the user to malicious content, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://midufefew.ru/strik?utm_term=gear+cad+drawings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458837/normal_601e669999a6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_6039b3fb4718e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383160/normal_5ff28e246e564.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/2115574.pdfIn PDF document text
    • https://tamejozapana.weebly.com/uploads/1/3/2/8/132814544/pozis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_600f40aac5c29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_a0dbcc144b254956a9081c7557b5e747.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebomedug/begf_101_question_paper_2016.pdfIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_e9c1d0014c034b2eb30f482595571e1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wurivuve/kabozon.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/evaluate_infinite_limits_calculus_answers.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_10e1f5e45d6745a0974e8d3039cc91e1.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_fe3b61b17b6343d9919576280096d399.pdf?index=trueIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_6acb96873f8c40d7a3fd0506989b45e6.pdf?index=trueIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_334c76deee4442b296e12c61071cb166.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_717f350539f04a1fa27a099498370f7a.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_fcf5971d31244445b4fe81d12b7f1919.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/31949989097.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_e201df4070e6450284ee5af99d8261dc.pdf?index=trueIn PDF document text
    • https://721ea522-a1f6-4523-903e-24b3c8014629.filesusr.com/ugd/5a834c_e2ad586dd7164cf59a46b6fe62e188ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/pavoge.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 4548 bytes
SHA-256: 0f494537d6ea17af9b13febb28aa259401720bcd9881d3de643b662370094141
font_01_sfnt_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 5196 bytes
SHA-256: 6bc4b17c7466c6fce26c76897e6d1640c99cbdd1f39db675eb99ccdf27d6819d
font_02_sfnt_off000124d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D6 10812 bytes
SHA-256: b85e3ca9efa01563c3de23d665aa10da40f9cf38ef69281718fb9ff87b456c27