Malicious PDF — malware analysis report

Static analysis result for SHA-256 241f13506e29c7ba…

MALICIOUS

PDF

79.0 KB Created: 2021-02-20 17:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4e982fca9b63b2ce277e2e757c9da42e SHA-1: 3bdb0735dc71a13e5d97bd703084642bad9ca0bf SHA-256: 241f13506e29c7ba4c52300048090144a8fefcc4e5ad12be309dbd7281a6ae29
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/strik?utm_term=shimano+di2+ultegra PDF link annotation
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/vudorulirixapepe.pdfIn PDF document text
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/lafejo.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/3301116.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/qhcAjhx/legends_of_runeterra_br_twitter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_6001f6627620d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373281/normal_5fe22e7de9b1d.pdfIn PDF document text
    • https://jejepijukutu.weebly.com/uploads/1/3/4/1/134131362/tegefobijitej-tajowugezudo.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/filosofia_da_educao_livro6j4ey.pdfIn PDF document text
    • https://cdn.sqhk.co/takulowizi/Ecgeid9/76322099506.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/7327355.pdfIn PDF document text
    • https://fupefomaxoxaje.weebly.com/uploads/1/3/4/8/134897629/temepu_pixuv_bedafan.pdfIn PDF document text
    • https://koralazuvumo.weebly.com/uploads/1/3/1/8/131871516/semurideku-newefajuw.pdfIn PDF document text
    • http://limaxinsto.xyz/argon_cations_anionssiq7h.pdfIn PDF document text
    • https://xikuvisaduwobax.weebly.com/uploads/1/3/5/9/135962120/6451331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/tezinuzoresu.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/71004375787.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/18807813036.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 5176 bytes
SHA-256: b21d504c9b345d437566ae72baea311cd914819d26ac7efc48161ac3ea9cb42a
font_01_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 14328 bytes
SHA-256: 82ad5ee97fc342bd589630f2ca0714c3de90c3da46965dc9eb11a97386126107
font_02_sfnt_off000120c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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