Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a7be5b2403fa13…

MALICIOUS

PDF

74.2 KB Created: 2020-11-21 22:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eda534f979b3acd6265c0637449e4d5 SHA-1: dc98bd5ab6b49dc1638e8cbe0d1fae6d578d8f80 SHA-256: 68a7be5b2403fa1382c1b06d0fc5e1e18bf09d34b4f4fdd141ef83c4af61ba64
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains like weebly.com, suggesting a link farm or SEO abuse tactic. The primary URL found is https://traffnew.ru/123?utm_term=cal+ripken+experience+pigeon+forge+schedule, which likely serves as a redirector. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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://traffnew.ru/123?utm_term=cal+ripken+experience+pigeon+forge+schedule
    • https://liziruji.weebly.com/uploads/1/3/4/3/134380663/zevonom.pdf
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/2815244.pdf
    • https://vafuzetok.weebly.com/uploads/1/3/2/7/132740798/manubebunufi.pdf
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/muzofasafepatu.pdf
    • https://velabusodogir.weebly.com/uploads/1/3/1/8/131858366/5b765b9.pdf
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/tomafirobabaxofivi.pdf
    • https://kuruxodevudule.weebly.com/uploads/1/3/4/7/134728431/5342627.pdf
    • https://jamisovuropasag.weebly.com/uploads/1/3/4/3/134396730/7ef05.pdf
    • https://tefimapotile.weebly.com/uploads/1/3/4/3/134351392/jinobu_bumofaj_jiwuk.pdf
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5fb35b093e097.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/bewomo.pdf
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/pewabikivebegenizow.pdf
    • https://sazukigozozabep.weebly.com/uploads/1/3/4/3/134310948/70751.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jolufozo/sundance_cameo_spa_manual.pdf
    • https://s3.amazonaws.com/tevigotu/47676306121.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_off0000cf11.bin
3750087ad24d93d2ab8cb1a61fe5d921ae85ef63e27b0744eb2808c232a098a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 5452 bytes
font_01_sfnt_off0000e19a.bin
58bb3ccc1d91382c4b25938bca9014fe592d2c2899084bc4a74b5cabae358f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 10760 bytes
font_02_sfnt_off000105a0.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 16204 bytes

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