Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6704ae299071da…

MALICIOUS

PDF

74.4 KB Created: 2021-01-08 15:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 55663a52aa2e07b665bb210e62b7517c SHA-1: a88e3689eacecd67a1abe4c037906810bd3fb27d SHA-256: 3a6704ae299071da5e749edaa1df29052b6f7293d120c8502004ff9032e865ad
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one pointing to 'traffnew.ru', suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_LINK_FARM heuristic further supports this, indicating a tactic to generate traffic or distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/aws?utm_term=aromatic+hydrocarbons+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5f9430be25342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380076/normal_5fe4b39b1149c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_5fbe8f7dca655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_5fb462c2a30d6.pdfIn PDF document text
    • https://zemotoru.weebly.com/uploads/1/3/2/6/132695551/xigemebizeloba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5fa93c1cabe3f.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/d48754fc-9632-4bbe-b7e0-8afd70c45bc4/63358445376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13f4598-0e1c-4518-912c-b8c086718c95/74878676537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9b0253-1700-456a-8ba2-39685313c40b/68330369299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b945924-d345-4674-ad93-79f066b27cb9/dmv_salesperson_license_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f73dcc-dbb0-4539-9514-17c4d6b37705/monadu.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/reckless_love_cello_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d25955-b680-45c6-afe9-1fd8b4abace8/5718532915.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_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 5592 bytes
SHA-256: a20877eda98891b356a0592c609b24e428f3de253f5b71bda7aab10ad8028a48
font_01_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 11256 bytes
SHA-256: de968e927b0792324f6e9326a8bbaa1a06a144380e58f01d228ff68f92d6139c

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