Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e29e38c60bf22e…

MALICIOUS

PDF

67.3 KB Created: 2021-01-22 17:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: da135975ada36d36a389b1b2a659110f SHA-1: 9b7923a1cb27b33562d132e2f9d2302a75c91976 SHA-256: f5e29e38c60bf22e3dd413fdb79d462aea1cafbd6497e01c6ffafea01ac925f8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to malicious or deceptive content, likely as a phishing lure or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/123?utm_term=ora+king+salmon+price PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390382/normal_60097c1cc774b.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/lukejegesusa.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/V6HUxhV/89106039993.pdfIn PDF document text
    • https://site-1171649.mozfiles.com/files/1171649/81976393529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5fc969251fd9c.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/r6hh2Gd/filofejatepugasa.pdfIn PDF document text
    • https://kasexesupa.weebly.com/uploads/1/3/1/4/131437862/wofonunudijuxumeno.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/fzijibs/94051564999.pdfIn PDF document text
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/a01f0b2.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/fji9iaR/white_huns_strategy_attila_total_war.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375073/normal_5fe3e3c3ad0a6.pdfIn PDF document text
    • https://penotogales.weebly.com/uploads/1/3/1/4/131438478/12e7bce7.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/yriekja/singing_in_the_rain_song_genre.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/dnFjdwt/nojokunogategiseg.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/giuhgN5/pemevadovakuwureraluxezow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_5fdc715e122a3.pdfIn PDF document text
    • https://site-1179105.mozfiles.com/files/1179105/tafenukidujujexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vanatul/wesesepijawodexiveni.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC999 5344 bytes
SHA-256: 1a90b9a235ffe7dda4f110396f0f1221c3dbed8fa2cd3dbafe30b556f14d63f0
font_01_sfnt_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 10904 bytes
SHA-256: 2fdaa10320a1ba8aff36f6380d9729c8fab04d30613df444efdc73ace1a68d3a

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