Malicious PDF — malware analysis report

Static analysis result for SHA-256 e644483d127f900e…

MALICIOUS

PDF

71.1 KB Created: 2020-12-22 21:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98048409790efb29ac22fa4a28759aad SHA-1: 1bf925a185184ef39485fcf90874102ca14d9b13 SHA-256: e644483d127f900e62747177cf7150ed978fee692914ed6417a6747f88fda28b
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, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically flagging it as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://traffset.ru/123?utm_term=riven+s6+guide', suggest a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the nature of the link farm and the high confidence verdict point towards an attempt to redirect users to malicious content or phishing 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-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=riven+s6+guide
    • https://gimifuzakid.weebly.com/uploads/1/3/4/3/134315082/4784420.pdf
    • https://golosoruxo.weebly.com/uploads/1/3/4/3/134339442/6cdb43a14.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3731638.pdf
    • https://sunakixekorej.weebly.com/uploads/1/3/4/3/134376052/rujoxixudolimil.pdf
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/xutiludaruw_zakis.pdf
    • https://cdn-cms.f-static.net/uploads/4407756/normal_5fa06b11a8771.pdf
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/096fc46624a1.pdf
    • https://piteselijofer.weebly.com/uploads/1/3/4/6/134608400/a1a3b8d8ff2.pdf
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/4631034.pdf
    • https://jodexozemusokut.weebly.com/uploads/1/3/3/9/133999246/9062289.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/farezelof/duzopekodujo.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd276b197e6261ba2b4012/1606231916011/kesobininixojekefer.pdf
    • https://s3.amazonaws.com/jowutoneranemuk/bio_study_guide_final.pdf
    • https://static1.squarespace.com/static/5fc0b3f1d49dd12447331c2b/t/5fc13fad1972c46e3ccc2090/1606500269597/29331108415.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3d7.bin
48a64b782adb48bf1a0ef555ba1de32bdeb6e64dac32b8cdded3f8706dadb0e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D7 4876 bytes
font_01_sfnt_off0000d497.bin
8d0cdf4bddf1a8d190c424f0e6ddc3abc198e843a05307b61d254ce416f9a8c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 10644 bytes
font_02_sfnt_off0000f921.bin
09335a9961666655dca33a3230139eb90ac9603d592f7819b39336557a4b02c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 16708 bytes

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