Malicious PDF — malware analysis report

Static analysis result for SHA-256 656ee6fab579955a…

MALICIOUS

PDF

67.3 KB Created: 2020-12-23 20:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ea99184cd9b9b0daedfd9b9a036314a SHA-1: dc1fb6fd1b9eddae21deaed72bbf8270e97ab228 SHA-256: 656ee6fab579955aba9359f99aa2c4d5680ccf739c547031a0f54ff694eb5d6b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs, such as 'https://traffnew.ru/aws?utm_term=raf+coningsby+weather+report', likely serve as lures or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=raf+coningsby+weather+report
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/dagowokujifemonul.pdf
    • https://cdn-cms.f-static.net/uploads/4426695/normal_5fa28e61568f1.pdf
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/febafd3d195a9.pdf
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/23f900c51f1a5.pdf
    • https://xeruwuxopexok.weebly.com/uploads/1/3/4/4/134467304/fapoja-litolan.pdf
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fbe30b5ae385.pdf
    • https://static.s123-cdn-static.com/uploads/4486742/normal_5fccdb1016a20.pdf
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/tategekufirapatenira.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vukujidor/avery_5160_template_word_mac.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bae4.bin
4f326103d3f2fd73c0afdc7708716b14a9800dc19daec4c04063c7d492b73f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE4 5372 bytes
font_01_sfnt_off0000cd3a.bin
2b0c41322841d1f9e097968350fa5ce050ef6a6c56f76bcf18075417fe138017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 11120 bytes
font_02_sfnt_off0000f2ca.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 4324 bytes

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