Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8f429bbb41be64…

MALICIOUS

PDF

67.8 KB Created: 2020-12-09 17:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 15f4bc783452afb134e2b5726e4e081d SHA-1: 2b686357c0c93c41c67ebe9bfb130a2b5e605588 SHA-256: bd8f429bbb41be6467de9cb4c4a2bb9b72fa5679d49e98561f29063eccc046bc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spam tactic to drive traffic to malicious sites. The embedded URLs and the document's structure suggest an attempt to disguise malicious content as legitimate search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/wb?keyword=srimad%20bhagavatam%20pdf%20in%20telugu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501659/normal_5fc37c05c31b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_5fa04e8d0b6c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408865/normal_5fc4d59e51c2d.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/fijirilipel-mijefufag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_5f9216c8ad063.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/7684367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4cf53c02f22b9d039a88/1606372597722/59863808259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a1ef5e-7065-4b35-aff4-967cc853517a/79705195683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7dc117-9b66-428b-99a0-47f6f7e80792/1999_saab_9-3_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5dd7fbda9c57a97e032dc/t/5fc7f11c21d0b76f1072259c/1606938909446/jufazovapizem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e640488a-ca81-4216-a261-b62d1b759b7e/nms_storm_crystal.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce2099564f736a582fbf84/t/5fcfe37bdab39e12420d7f14/1607459709252/posutomopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838c8f5a-e4e3-4bef-96a2-45963df6cec9/wifefutatofabopix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b22be2-ece2-4819-891f-34c630221141/powerplay_pro_8_manual.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_off0000b37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37C 5580 bytes
SHA-256: a13af092c24a273282314c293a6c95e19c3bacc1680099fb7dc3c52c96f8e8fd
font_01_sfnt_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 11628 bytes
SHA-256: 2fde17dae63ecf680564bb1349248a6f0bf0b73b1357a5018719514e6402120c
font_02_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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