Malicious PDF — malware analysis report

Static analysis result for SHA-256 636ff681a733ae8f…

MALICIOUS

PDF

68.0 KB Created: 2021-02-16 18:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2d7b67f98f7af001b731b1766391f686 SHA-1: 233b7e20c1e5094b9f50699a8447c9c756a0d778 SHA-256: 636ff681a733ae8fea2cf6e3148e335e9124274ea1dc415d53acd8a966ddf0eb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=graco+pack+and+play+silhouette+manual PDF link annotation
    • https://cdn.sqhk.co/kokademesuz/fgjw1jh/text_alert_tones_iphone.pdfIn PDF document text
    • https://mixofugu.weebly.com/uploads/1/3/4/3/134351041/5729835.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/jomakukujqtvnp.pdfIn PDF document text
    • http://istra-backwater.ru/jerozotowosakafazem4vhp.pdfIn PDF document text
    • http://ro-shop.space/action_hero_biju_videono5fa.pdfIn PDF document text
    • http://nakanilo.club/769479738800nvox.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/7chhvf0/free_computer_learning_games_for_7_year_olds.pdfIn PDF document text
    • https://cdn.sqhk.co/wizevomorofe/jieibji/ruxowesazasod.pdfIn PDF document text
    • http://axacheat4.xyz/53486514035xovv8.pdfIn PDF document text
    • http://agreevudb.rest/30903718379jty7x.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/TFiedif/mupik.pdfIn PDF document text
    • http://mrshadow.net/kewerovetizipidel7folu.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/ronatiduzoxij/48149523739.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/jokitetibirojeresirikimo.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/beetle_bug_2_apk.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_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 5508 bytes
SHA-256: 5ffa508f57c96aeb77420df2d292652337a08ed35c4339f9f8af4b9f69a2d7b4
font_01_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 10888 bytes
SHA-256: bbf48e92df86be8da0d7f490ca56ce43e1716ebd6e2264b37fb76a41c9b29880

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