Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c3a503941c1c91…

MALICIOUS

PDF

72.3 KB Created: 2021-02-12 06:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d87075b400e0d52e4a88c5c9cd7ab5fc SHA-1: 576211507c191766dabc3acffb31973716ec0b73 SHA-256: d4c3a503941c1c91032bb98e1e0f23d711e151703006e0ce7d4a67fc474cb77c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to suspicious domains, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/wix?keyword=atlanta+institute+of+music+and+media+degree In PDF document text
    • https://cdn.sqhk.co/gewanunu/9Aihegj/viwusovipu.pdfIn PDF document text
    • http://zemawage.22web.org/gofegumiganodatemow.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/ChHQqhg/98165990643.pdfIn PDF document text
    • http://tuworiki.22web.org/pilubiwutofiwafetepovuge.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/hgjdjgr/minecraft_chernobyl_map_1._7._10.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/fgghmJd/xililugitisalanivu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mowosafawun.rf.gd/98467812567.pdfIn PDF document text
    • http://jugikan.epizy.com/80381565167.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/87343565102.pdfIn PDF document text
    • http://wetafemef.epizy.com/fslabs_a320_loadsheet.pdfIn PDF document text
    • http://bopikor.epizy.com/schwinn_biodyne_manual.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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 5328 bytes
SHA-256: 932e3e03a04faaedc10ba3aa5a426260cd5f23d10bb4d6038ab8743a0d3d25b9
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 10764 bytes
SHA-256: 899ea9dbea3ec39be76f421052b5f0a8f26904dc6f58715ec50ddd65cae3e235

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