Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc235260ac8b6ad…

MALICIOUS

PDF

73.1 KB Created: 2021-04-04 08:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c5935df480f9807619b85739385851b SHA-1: 7d2df0af05f11920b244c0cabbae5948661cc0d3 SHA-256: 7cc235260ac8b6adf89ed9acbb667ee3e74d16161eba92182725a340bb0caf55
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, which is indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it is designed to redirect users to malicious or deceptive content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://botokaw.ru/123?utm_term=responsive+carousel+jquery+free
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5ffe8563927ed.pdf
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/tivonaloderazutig.pdf
    • https://cdn-cms.f-static.net/uploads/4410441/normal_6062da6b9621c.pdf
    • https://lesikikonojen.weebly.com/uploads/1/3/0/7/130740189/3881315.pdf
    • https://cdn-cms.f-static.net/uploads/4476001/normal_6049b2df535ba.pdf
    • https://static.s123-cdn-static.com/uploads/4386593/normal_5fe4083d2296a.pdf
    • https://static.s123-cdn-static.com/uploads/4447280/normal_5fe485e27881e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muxozuvalubi/88035046188.pdf
    • https://s3.amazonaws.com/jozaponi/twilight_saga_full_movie_download_free_in_hindi.pdf
    • http://xokesuluz.epizy.com/82125406402.pdf
    • https://s3.amazonaws.com/jujojomojemiz/easy_piano_worship_sheet_music.pdf
    • https://s3.amazonaws.com/saxefi/daxolusiwojabusozejo.pdf
    • http://fafamusefene.rf.gd/how_to_clean_the_brush_bar_on_a_dyson.pdf
    • http://gexijobuvakoxob.rf.gd/pexoxibabatezex.pdf
    • https://s3.amazonaws.com/fowikorejodi/25256844234.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e314.bin
4b2b29173114308e93be2ecbc60d9be2bcb70ae9577ea60f2dfaedb692255fc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 5380 bytes
font_01_sfnt_off0000f590.bin
c368368f661538c8317a9262e8ed96c2e80ac95b3ea7fb5837612e657d5ffe2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 10104 bytes