Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb159e01b8eecc6c…

MALICIOUS

PDF

78.7 KB Created: 2021-03-04 04:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 663909b72359252ad084b0d9adf9e0a1 SHA-1: c9e6c30567d3ac6c10657bdb0471a37e45d4265b SHA-256: fb159e01b8eecc6c4d1e363d72a2b76eef256f46fd757ba9ae27c08e44cde023
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics point towards an attack pattern involving redirection to malicious sites.

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/123?utm_term=formula+de+solucion+molaridad PDF link annotation
    • https://cdn.sqhk.co/vulovosovem/jhjbMje/past_future_mp3_song_download_pagalworld.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/18360012472.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/sosatuxafavidokeli.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/bubad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5fe8b7679d8ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_603081ca0251d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459917/normal_5fede456261df.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/bdWJgi2/wogizuwasuwoso.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/fmxFJjh/sefasopowomuditodomuza.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/ajeja6p/rilebev.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
    • http://vujuvisesakok.myartsonline.com/wesefajonifobesiwiveliru.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/does_praying_help_depression.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/pedigefat.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/aerospace_science_and_technology_journal_template.pdfIn PDF document text
    • http://jofesosozofoso.epizy.com/beehive_9th_class_book.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_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 4840 bytes
SHA-256: 64370a2fa9b3c258e1dd23f240bf3709662bbc17113519673e1d141705255faf
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 11964 bytes
SHA-256: 1ca1db9ff18e8625667c4b35905ec335fde92d25b06473162d1ee846b0c7dc91
font_02_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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