Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4ff025e7d01539…

MALICIOUS

PDF

70.3 KB Created: 2021-01-23 00:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfbe654b33d04bfd1cc58774b5832ada SHA-1: deab1c19eb60464a9c327aa6e11238d8c03a1bb3 SHA-256: ac4ff025e7d01539db40bea76328eeb8960c90b864310bd8e99fbcd46e83d0eb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, likely intended to drive traffic to malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, possibly for SEO manipulation or phishing.

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://traffking.ru/aws?utm_term=welch+allyn+otoscope+ophthalmoscope+set+manual
    • https://kotedakivon.weebly.com/uploads/1/3/1/6/131637811/tubodilim_botuwewujebefi.pdf
    • https://site-1168247.mozfiles.com/files/1168247/race_kings_download.pdf
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/poralebukopet.pdf
    • https://rovisudaguxu.weebly.com/uploads/1/3/1/4/131438800/zotukazosogi-mawufepi-jaxejofixop.pdf
    • https://wokonupojelofa.weebly.com/uploads/1/3/5/3/135351156/lalajuzatonixufimeke.pdf
    • https://site-1240846.mozfiles.com/files/1240846/9451107890.pdf
    • https://site-1176842.mozfiles.com/files/1176842/95938129856.pdf
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/nazakozojilegez.pdf
    • https://site-1179689.mozfiles.com/files/1179689/arnold_renderer_for_maya_2017_free.pdf
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/eda9994c183b698.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rimamosapike.epizy.com/96720671865.pdf
    • http://nasewuji.epizy.com/nimonot.pdf
    • http://gakupoxefale.epizy.com/c_o_kancharapalem_movie_free_tamilrockers.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_off0000c9b9.bin
9033877f6e25f97f5dcf772919c1a97e30a95fb7cdfd391703441df3f73c6c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 5028 bytes
font_01_sfnt_off0000daba.bin
a33e354f37b111acd90a627eb2bdb2a30117fdd0c159bf852ba5ca4be1797e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 10408 bytes
font_02_sfnt_off0000fe26.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 4324 bytes

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