Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dac9c2fdd38ec1a…

MALICIOUS

PDF

75.4 KB Created: 2020-11-22 00:23:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f87d9cd40850602dca6054d277074e6 SHA-1: d03fe35ab029d8a71986d01b3ced45f14768fa69 SHA-256: 0dac9c2fdd38ec1af62de5eba6f0260ceabb8ce3961dc6e4291f52ef379b7825
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the link farm heuristic point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=south+kolkata+puja+guide
    • https://vimikipemaw.weebly.com/uploads/1/3/4/3/134331773/2594efa50ff.pdf
    • https://joguxakiwemov.weebly.com/uploads/1/3/4/7/134707067/53fb084a2174af1.pdf
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f874f80c5338.pdf
    • https://cdn-cms.f-static.net/uploads/4408862/normal_5fb3f818bbe8d.pdf
    • https://cdn-cms.f-static.net/uploads/4447280/normal_5fb493c42a1b1.pdf
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/17ed08f24c2.pdf
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/1429013.pdf
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/demizagoxum_gowetofuper_rigif_nizidixaxojaxof.pdf
    • https://kimuximufa.weebly.com/uploads/1/3/4/1/134132687/nepevovenamik.pdf
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/988260.pdf
    • https://vusiwofadenu.weebly.com/uploads/1/3/4/2/134265349/vuxam_sumobabut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitajosasa/squirrelflight_and_leafpool.pdf
    • https://s3.amazonaws.com/wujapu/14057814826.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec66.bin
96a9ec6340b8d935ad6ff799630f625eadcf2731746ee40eed20013abd851e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 5192 bytes
font_01_sfnt_off0000fe13.bin
6a60e6d185a9364f1735262c515e07cd2a97c942f63d5866bb42fef9c59b4373		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 10312 bytes

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