Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa2a393bf329a24…

MALICIOUS

PDF

68.4 KB Created: 2021-02-02 16:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e6898fca13980f15e6d1d749b6378628 SHA-1: 29ac4043eceaadbcff4867893916a47568ce39a0 SHA-256: eaa2a393bf329a24efa191a1d3d6ddc4408c40999ee7eb8d07f492d3d6020e86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/aws?utm_term=reported+speech+indirect+questions+exercises+pdf PDF link annotation
    • http://naykaryadom.fun/595598380693m70c.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/buluwofazagevi.pdfIn PDF document text
    • http://wisitens.online/rovobefudapugewixuxiwubd3re.pdfIn PDF document text
    • http://eeeeeyyy.space/felugozuvapefoj0odqh.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/59b5n7P/ludigigapade.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/448753139653myvv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411702/normal_5ffad4eb44296.pdfIn PDF document text
    • http://fb-pageunderreview.com/sufusazamawaxewiwuybbc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_6018512b19b54.pdfIn PDF document text
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/9a37bf771e47b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_5fd139282aeef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527859/normal_600087175a4b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407789/normal_5fe9d2dbce160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_6011a94953e50.pdfIn PDF document text
    • http://nikaold.site/outer_space_cartoon_pictures5ytey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501484/normal_5fc5c850305d2.pdfIn PDF document text
    • http://feedbacrnz.space/98716704878rkl53.pdfIn PDF document text
    • http://begetus11ppz.xyz/nuvobusopuvukugigop2kc60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF3 5200 bytes
SHA-256: 29241a5e4ff90c4c2888381610babd83d6f05e32d9b5fdf2e26710c069eb75f2
font_01_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 10464 bytes
SHA-256: 5b9f9e766b0df600b9b5685a00de6c216b18d82beb656fccd2fa4b7696ab8ce6

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