Malicious PDF — malware analysis report

Static analysis result for SHA-256 137d0227fc19b450…

MALICIOUS

PDF

71.2 KB Created: 2021-03-17 23:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 892ff3a4f17ed38e959499271541f376 SHA-1: 499bc53aaffd05e61b9f081cb5f86e507b5cd3c4 SHA-256: 137d0227fc19b450a3158aa2b90dbac6bf04a7fe4e2e0ce84a5e731367e066b3
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious content distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/award?keyword=estimation+and+costing+book+pdf+download PDF link annotation
    • https://betetitowuti.weebly.com/uploads/1/3/4/3/134331261/6729098.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/ntn_roller_bearing_catalogue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_6014f58353071.pdfIn PDF document text
    • https://nojesinas.weebly.com/uploads/1/3/0/9/130969722/tavagazix.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/fevovoxijurolakumalubom.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/djcViaD/1442280413.pdfIn PDF document text
    • http://jezuxomedoz.iblogger.org/vivatemunipepaseregirolir.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/Ghiahav/xeruruboxi.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/8Pmgegf/dsi_24._bolge_iletisim.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/fermat_s_last_theorem_answer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373241/normal_5fde84c61a8fb.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/fozofulegapifovobabe.pdfIn PDF document text
    • http://vadusulu.iblogger.org/donald_duck_meme_template.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/ajc8gjN/paypal_donate_wordpress_plugin.pdfIn PDF document text
    • https://cdn.sqhk.co/mowezeto/hxcijij/80108827451.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dadagax.epizy.com/idiom_dictionary_free_download.pdfIn PDF document text
    • http://jopinewo.epizy.com/how_to_help_knee_pain_in_bed.pdfIn PDF document text
    • http://vekemelegewimo.atwebpages.com/malaysia_budget_2020_highlights.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/xovabasawopevisu.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_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 5632 bytes
SHA-256: e054cb017ae079dd65b3e42a0abe4e7fc3e3cac4dc77e6d4314eabcd413cab63
font_01_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 9980 bytes
SHA-256: 8f59fc7f5ed7b168dd7ed799412b870a9e95d53629c574a05ea52dba672fa83a

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