Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ad37a12b9db228…

MALICIOUS

PDF

71.8 KB Created: 2021-02-17 08:19:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e436b7d0a01d6c270adfc9efd26334b5 SHA-1: ab275fef84643e8ece86fee386ca802b7771af39 SHA-256: d7ad37a12b9db228230afb07956066b8358defdfd51d542d91272444c413ae97
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to pasta, which is likely a pretext to disguise the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=bow+tie+pasta+with+italian+sausage+and+broccoli In PDF document text
    • https://cdn.sqhk.co/woxemumi/gi1hbha/world_war_z_movie_online.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/Bjiicko/jukuk.pdfIn PDF document text
    • https://sulagumafiwez.weebly.com/uploads/1/3/1/3/131383207/9481959.pdfIn PDF document text
    • https://xupulepil.weebly.com/uploads/1/3/4/3/134322414/debomuvuri.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/gurafoga/dispute_something_on_my_experian_credit_report.pdfIn PDF document text
    • http://devuzobek.rf.gd/radio_bodor_sunda_cangehgar.pdfIn PDF document text
    • http://bexituxupogetav.rf.gd/81619823365.pdfIn PDF document text
    • http://vovugezufined.epizy.com/acr_guidelines_for_gout_management_part_1.pdfIn PDF document text
    • http://wedutatitupaze.epizy.com/37308055982.pdfIn PDF document text
    • http://ledolabufimo.epizy.com/24606200885.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/34365776997.pdfIn PDF document text
    • http://suzawelo.epizy.com/fobeforiroxasajijumu.pdfIn PDF document text
    • http://xupewosupegosax.epizy.com/59822942432.pdfIn PDF document text
    • http://bevevekafoli.epizy.com/menabugag.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/gst_amendment_2019.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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 5616 bytes
SHA-256: fd8171e1f703d7a22c232f800adb831cbd93c07eeb9514534b27109117765493
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10756 bytes
SHA-256: dc0edf5f51102d0ca55c428ed1639beceb037968935c0e58d2de6a940fa8d6e1

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