Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee1cf5f12e406ae…

MALICIOUS

PDF

75.9 KB Created: 2021-06-01 13:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f426d5ff16bc3dad1468366e5372a66c SHA-1: aa39924b302492838d049d14c0dcb4839324e89a SHA-256: 4ee1cf5f12e406aebd6711430a57056c0e6b9179992cc261770216dcc883cb53
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the sheer volume of outbound links is a significant indicator of malicious activity.

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://jottigo.ru/123?utm_term=redefinir+athoms+mbuma+pdf PDF link annotation
    • https://zanonolupurezo.weebly.com/uploads/1/3/3/9/133997165/42e7532.pdfIn PDF document text
    • https://gunefadube.weebly.com/uploads/1/3/5/3/135388078/kozerojiwebaduteg.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/5936912.pdfIn PDF document text
    • https://tagelararejo.weebly.com/uploads/1/3/4/8/134846357/vibizaf.pdfIn PDF document text
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/wilokezuroxivurexiv.pdfIn PDF document text
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/nirisudokavexiv-rufen-nasufakogixaf.pdfIn PDF document text
    • https://zomubotedop.weebly.com/uploads/1/3/0/8/130873922/javusamovazif.pdfIn PDF document text
    • https://nelupevono.weebly.com/uploads/1/3/4/3/134305158/duletuzan_nitunifibakag.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/a0c84ae.pdfIn PDF document text
    • https://kinuguno.weebly.com/uploads/1/3/1/4/131454024/4216379.pdfIn PDF document text
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/efc1eacf4a7.pdfIn PDF document text
    • https://xamifixi.weebly.com/uploads/1/3/1/8/131871938/3d4ae1ec81.pdfIn PDF document text
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/bevalataw-vodil-vuzaz.pdfIn PDF document text
    • https://dowazulipogopu.weebly.com/uploads/1/3/4/3/134322731/lidodimotudes.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/fusimuwilera.pdfIn PDF document text
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/begejodinim_madonugonube_latik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144426093/32794490036.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144413424/13442655968.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5D 5396 bytes
SHA-256: e752e6f505acdd34b5a45af3121303f8901815860bedf852a0996870995d6639
font_01_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 13604 bytes
SHA-256: ad0a8143d4d7019e9ebbdd92d035d2cd3b4ba9241a60d151eeef58e1443a0544
font_02_sfnt_off00010be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE5 16104 bytes
SHA-256: acd0e9cbffa3246949c631db7f96d6501dd019ec138b1d4ceda3994cb7200222