Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4acdc982faa0af1…

MALICIOUS

PDF

67.4 KB Created: 2020-11-14 16:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7d57b9fa4917d7556a318072f60c9e3f SHA-1: 581e9c61d78d2e590859ff1a9e8a4e3abc51aa04 SHA-256: b4acdc982faa0af175d9feebbd32e3c70023728f69e35ffc94fddb3e2552dc31
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafftec.ru/strik?utm_term=agneepath+poem+in+hindi+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447093/normal_5faf9d7301836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5fa965c093c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5f8cbd80b3d6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f8fa009044fb.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/xopotiposofefu_birabus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f880d0885ca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5f9fe266ee25c.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/61f3b879-7fd1-4760-ac96-0694232927bf/36242282260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb568287-a68b-44b6-bc0f-0c05e6abb88a/when_is_van_halen_coming_to_atlanta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05f476a-d91a-4e76-941d-d3be57a2d6a5/33264653768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0022ff5-d45d-46eb-a525-2e9ac4cd84c8/how_tall_is_geralt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d5da7a-197d-42f1-a4e7-599dc9d57dbe/labelitoxizupiguda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79984e8-7fb8-4de6-af5f-50400933eb66/iso_zelda_skyward_sword_fr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c777cb03-4a51-4395-86ec-f1be8d699e4e/74054603722.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 5136 bytes
SHA-256: eaa3dff8dd8e744bb51b46ab47fe1ff7a1e32fbcf99c48dd5e489922324ca23a
font_01_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 9884 bytes
SHA-256: c892c294d5ce677c19544a14c7145bc793d0128710d48815139ebda0e25a1cc5

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