Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdb191398a2d5f5…

MALICIOUS

PDF

117.7 KB Created: 2021-02-19 02:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5cf9ea1982b17b8b80ffe323bd217fd4 SHA-1: a2a05f8fbc881e022bd2bd3a2d613a5fcabef40a SHA-256: 0bdb191398a2d5f5f1014ee923f1c7bbca9db3c0802c833b77d3e4b7b7af7ee0
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 domains and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of external URIs and the structure of the PDF point towards an attempt to redirect users to potentially malicious content, likely as part of a spearphishing campaign.

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/aws?utm_term=what+is+the+purpose+of+research+studies PDF link annotation
    • https://cdn.sqhk.co/duburijudi/0q9JcvY/aws_iot_architecture.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/sWhbYlL/dipubej.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/6296575.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/sodakogafilosopu.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/ijNaXje/marvel_contest_of_champions_hack_forum.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/bggmTSG/77516400052.pdfIn PDF document text
    • https://nejajabowiwuxo.weebly.com/uploads/1/3/0/7/130775705/4223900.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/jhge2eo/ringtones_galaxy_a20.pdfIn PDF document text
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/fupazibudaso.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/10860297321m9mgg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bozalusi.epizy.com/video_maker_for_pc_32_bit.pdfIn PDF document text
    • http://somizifiwij.epizy.com/centred_log_ratio_transformation.pdfIn PDF document text
    • http://befojarariwowab.epizy.com/bruce_lee_songs_sen_songs.pdfIn PDF document text
    • http://jegozejixal.epizy.com/dovazelajet.pdfIn PDF document text
    • http://tomenederixi.epizy.com/50416304924.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_off0001905e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1905E 5224 bytes
SHA-256: cb5aebfc4c2229b01e3221b3f529f10462742a68145bda8c8ad4017a36483c90
font_01_sfnt_off0001a22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A22C 11640 bytes
SHA-256: f9177c0c8485ff13296ec79298db3807cce00ed724d06da7b05e87b717729e80

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