Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca813bc73299f5e5…

MALICIOUS

PDF

75.0 KB Created: 2021-02-25 08:12:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 254ff11db31404e5c1fb145551820940 SHA-1: 977883ba89336953e95a764d12246040ded0eeb4 SHA-256: ca813bc73299f5e56afe3fd12e9ea1f004f767125e7d8b8183c5c8f53bd6bf4c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful content. The document body, though partially garbled, appears to be a lure related to sun exposure, masking the true malicious purpose. No scripts were extracted, but the presence of multiple external links points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=como+n%25C3%25A3o+descascar+a+pele+depois+do+sol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471249/normal_60303d79c34b6.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/16094037228.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/ribojebasaxem.pdfIn PDF document text
    • http://arfesopt.com/guxojogizolixatebakiotp9.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/puvawutudet.pdfIn PDF document text
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/634d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_602f835b3422d.pdfIn PDF document text
    • http://ximikilanad.22web.org/dudoteravavowesoker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_6001c64b7e402.pdfIn PDF document text
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/boluvida-zafexoxowosuj.pdfIn PDF document text
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/sekot.pdfIn PDF document text
    • http://wozonos.22web.org/fenegovarofunodig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_602a2a86b3461.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foripoj.epizy.com/6739531896.pdfIn PDF document text
    • http://notizawudix.epizy.com/is_the_food_safety_exam_hard.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_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 5444 bytes
SHA-256: bbf43ac998c30ca639c2bb8250f590ab072fa74379908be7e0135ef7be9b5918
font_01_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 12856 bytes
SHA-256: 527cfd146e8c1092efc5037354a426191225daf0a17724c60cfa0e63bf713c47

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