Malicious PDF — malware analysis report

Static analysis result for SHA-256 28017e6064e07e16…

MALICIOUS

PDF

70.4 KB Created: 2020-12-16 07:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af847237ad21e5175939e389b32a305d SHA-1: 13d6b3c1aae9194921e5d4a592df89a693ed10dd SHA-256: 28017e6064e07e16ef91000e9ad52a5e7e36af8d6a461280133fdd003315e8d8
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, indicating it is likely part of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. The document's structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=ptp+nusantara+3
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/zupuvajamuz_sunones_luxanolaxupob.pdf
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/vubesajoxeze_fofuvukuvuxofa_kuxaxereg_gebasilubamidi.pdf
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/makur.pdf
    • https://werogevudabewox.weebly.com/uploads/1/3/4/8/134876313/pexabutaji.pdf
    • https://gemujofu.weebly.com/uploads/1/3/4/3/134372819/b37af5facdb48c.pdf
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/rixep-wusila-fumisabimajavaz-xatexozufu.pdf
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/gilofajurusumikutu.pdf
    • https://bigakobavivab.weebly.com/uploads/1/3/4/7/134747120/rasevul.pdf
    • https://kitafawavan.weebly.com/uploads/1/3/4/7/134702073/garebupirug_tixexalizufek_vomexebogixolum_somagaj.pdf
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5fa0bd1e1c91d.pdf
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/rejovunes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/565b979d-7bdf-43e0-b1f9-df2f279616d7/xujubefazenopolikabuvi.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_off0000c29b.bin
54d83cdaed6422336a73e2e6c7c72e192c2feda19a55bdf1542be5db26bb356e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 4552 bytes
font_01_sfnt_off0000d201.bin
ef170d4b7369ecfd561c3bc72032de3f5ea8cb02c7370a6edf1ed5c97f81ac07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 13272 bytes
font_02_sfnt_off0000fd39.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 4324 bytes

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