Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05655fd47e60eb3…

MALICIOUS

PDF

65.8 KB Created: 2020-12-13 21:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a5e72586f4fbdc418836772cc734f62e SHA-1: 18a77543f1637556d6d638bd8f57cd7b82da2578 SHA-256: a05655fd47e60eb3e32a9ac32e7849f80a241306c92e7bf7657a27cbb1d552c4
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary malicious URL identified is 'https://trafffe.ru/aws?utm_term=convert+image+into+text+software+free', which is presented in a context suggesting it's a search result for free software. This indicates a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

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://trafffe.ru/aws?utm_term=convert+image+into+text+software+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f87116c1fbde.pdfIn PDF document text
    • https://bigififipajug.weebly.com/uploads/1/3/4/7/134709095/susalevuzapupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_5f96be3f4d597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5f9e7cff5c68f.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kinufijozulof.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/1a6723fd-4d15-479b-a53a-1e8652dc6b00/54377715516.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6f350f9cd615d7ca4cfd5/t/5fd08cae89fd2c07d10586ef/1607503022072/49046891372.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1520988c99b6d37aa082c/t/5fc50708cb3e0f5771edef19/1606747918946/dark_brahma_chicken_colors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e25973-1097-4274-b4dc-77bf7ac4e93e/dakifara.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a459d79364840843980/1606371909454/four_texts_on_socrates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9435fcf5-8ba2-47b5-8128-d067243daaf1/15194660362.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc553ca11f6a41984a31074/t/5fc825c6e101942bf7656eb5/1606952390619/bedroom_furniture_for_sale_near_me_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8124246-5a21-4861-a9e6-44caa68d1587/10286641972.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_off0000c67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67C 5180 bytes
SHA-256: 94504506cfa98b62ece65b034cf2dd89ae91967a9fcd84b44e5abed8b8f7a1bc
font_01_sfnt_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 10040 bytes
SHA-256: 3292f8ae58b2f8a6df1ea1b6747518ef435521f8c29823d9e566b94127724e13

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