Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a3175b4dff58d8…

MALICIOUS

PDF

109.5 KB Created: 2021-02-12 05:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1d49acefd801bf000d4ae3cc6ed3075f SHA-1: 706b43143bf9f65e498b5d79e546ebbc506638e0 SHA-256: e3a3175b4dff58d83ffc2f6fc0eedef390d64fc613b0f89420e900cda83fdd0e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=is+john+in+the+old+testament PDF link annotation
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/578140.pdfIn PDF document text
    • https://tibufidis.weebly.com/uploads/1/3/0/7/130740046/jelulumuxijoboperav.pdfIn PDF document text
    • http://ita-yog.space/fuvedevuwui9pc0.pdfIn PDF document text
    • https://ganuzuvotaju.weebly.com/uploads/1/3/5/3/135304652/fesegimemase-wutesopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_601314a2cb23c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_60032432d64e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_60142eea5ee90.pdfIn PDF document text
    • https://bojowavezuzabi.weebly.com/uploads/1/3/1/3/131382797/monafogetojun.pdfIn PDF document text
    • https://wufewevaso.weebly.com/uploads/1/3/1/4/131453291/rejifilebu.pdfIn PDF document text
    • https://dimebogative.weebly.com/uploads/1/3/1/4/131406505/lopumoxusiz_togubipup_bokijig_zikuv.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/db5df8ce1c6d168.pdfIn PDF document text
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/kaxifap.pdfIn PDF document text
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/biramigufowi-dapalafas-fizeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_600ba23bc5e26.pdfIn PDF document text
    • https://guvopizap.weebly.com/uploads/1/3/0/7/130776702/342246.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/satulibaren/rompasso_angetenar_original_mix_song.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_off000167ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167AD 4980 bytes
SHA-256: aad4be948916e5350d8bb5eef5788f98547165175b5607ef6a69b96cea419000
font_01_sfnt_off00017875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17875 15640 bytes
SHA-256: 7bd220bfbdb8e4a5db25fcd53f4682dce605f3e090acc36fb0ba651567361a33

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