Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4a2ccef84252e7…

MALICIOUS

PDF

70.7 KB Created: 2021-03-15 19:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 51652b94ece565741e2627687b6888fa SHA-1: a29ac678cb862edff10f725215d4ee41e8bd6984 SHA-256: aa4a2ccef84252e7bec3eb0723d78b42ef75f75a28e2242a5bf743d1a10c3ed5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a popular song download, suggesting a phishing or redirection attempt. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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://kuzutuzo.ru/wix?keyword=pokemon+diamond+and+pearl+theme+song+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480170/normal_5fce7620b31b3.pdfIn PDF document text
    • http://gazeloguxa.22web.org/the_autumn_leaves_piano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424349/normal_60285c85ee262.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/gusuxowale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490263/normal_60303c419a834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369153/normal_5fed6631dfe3c.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/dewolubixobujabelo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451757/normal_5ffaa8f78d5fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/85330ace-ac5a-4815-bbe6-b0842330cd92/kaxaf.pdfIn PDF document text
    • http://mawokale.myartsonline.com/fifazakepapesenufip.pdfIn PDF document text
    • http://vubuzixefixa.onlinewebshop.net/where_can_i_find_my_hidden_photos_on_instagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49bb147-7716-49b6-a7a2-75d2d0ed29ab/21134923433.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/niwofiniwisode.pdfIn PDF document text
    • http://muxolisakij.epizy.com/73581553449.pdfIn PDF document text
    • http://pidejekakej.epizy.com/suara_burung_cililin_di_alam_liar.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_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 5528 bytes
SHA-256: a8a716e1b851bd8badd93299ebabd218f334b2854d285788444a44ccf62d028a
font_01_sfnt_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 11172 bytes
SHA-256: d2bb8f55c32219d2dff21d588c1c58a0002fbcce02dd940442becf79e1952694

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