Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a5a739724fe06b…

MALICIOUS

PDF

111.0 KB Created: 2020-12-07 12:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5388afdbfd5250db0833d72170c07419 SHA-1: 53f3b575516bbaac7f94addfdc9d96eb7016d407 SHA-256: 04a5a739724fe06befb717ba0e47683c36e7ca095b518c80a3dab1023b93fe9f
156 Risk Score

Malware Insights

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

The PDF contains embedded links and a document body that mimics a search result, directing users to a suspicious URL. The presence of numerous external links, including a link farm heuristic, suggests an attempt to manipulate search engine results or distribute further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=java+string+format+integer+2+digits PDF link annotation
    • https://garupiripo.weebly.com/uploads/1/3/4/3/134386314/zifula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fb4c782938b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5fa0ba27ad13b.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/binumebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb89ee54-2158-406e-a087-32de12d8fb9a/pajebiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad79f20-7749-46b6-8ab9-a82fe66b60d5/gizexirawi.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/xusinozadozuvazujukid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68268bf8-062c-4773-83cc-da33c5df7ff6/onlinemeded_intern_guide_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58f6ffe-f2b2-4840-85e8-dddedbe59f86/lavaxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4c4028-5ec2-4aa9-9ecd-afed2cac245c/66981733691.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/24913056511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c10e6b-6197-4cf0-90f4-d675cd67f308/venom_lethal_protector.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF3 5376 bytes
SHA-256: 2d9380020c52a71d66c77aa18659fd81f4e350e1fa94835bd0018d9bce9f7661
font_01_sfnt_off00017237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17237 11756 bytes
SHA-256: 5f185f78db1f7d5e1b445b345955d25b2cf9258e674ef29d0dfb9005bbc99559
font_02_sfnt_off000199fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199FE 16088 bytes
SHA-256: 97e8fdbbd6f7f3cc7c5be7fd2b67e2205d24646122122f1230a4e601f0c8c96a

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