Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e58a4aea35f1fa…

MALICIOUS

PDF

94.2 KB Created: 2020-11-17 19:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9d67b2727769516f2ff7b65259d87fba SHA-1: ddf6f83ff2c4ccc7e021ea996b9d00e215569245 SHA-256: 16e58a4aea35f1faa84c05641df01a40fed6620f587634cadab28d34e761c94f
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://traffking.ru/123?utm_term=manifiesto+partido+comunista+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408983/normal_5fa2160a8d667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480899/normal_5fb3652bf0407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_5f8b03cc85497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_5fa015d45216d.pdfIn PDF document text
    • https://tuwunujanopir.weebly.com/uploads/1/3/4/6/134617400/kajewaxulizo_ruwogesas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390382/normal_5f9ff50c1bcf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f8fd35ce5004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f9c7c909f139.pdfIn PDF document text
    • https://mematuseb.weebly.com/uploads/1/3/4/5/134516495/5461574.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/b94e1a.pdfIn PDF document text
    • https://xagegebalelil.weebly.com/uploads/1/3/4/5/134579129/fekudik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f88c6a359be1.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/vatozona.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/42a115ae-f2dc-48ab-b688-5a40a34da1f6/zetasunivixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4bc9b3-6965-496c-a487-a44f36452698/combined_variation_word_problems_wor.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_off0001326d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326D 5276 bytes
SHA-256: 84b6c704c42bd548b9b4dbfd078af01e9274f511d607cec68f28d0aa274bd2b7
font_01_sfnt_off00014459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14459 11620 bytes
SHA-256: c8b9f4d8a907ccc1aee45690048e4ca569065b3207420b16dfdd9556ddb2061b

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