Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa33f3395c00602…

MALICIOUS

PDF

73.2 KB Created: 2021-02-09 19:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3ac7aca68a4e375f1311daa17e29a903 SHA-1: cba9172d4260d3caddfa7f04ab3d942be989d565 SHA-256: 8fa33f3395c0060231d140530682418973252d6fc8b8377e90fef3a75c8002f3
174 Risk Score

Malware Insights

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

The PDF contains multiple suspicious links, including an invisible link to 'http://ig-supportcenter.xyz/pretest_internal_medicine_13th_edition_free_downloadco8md.pdf', which is designed to trick the user into downloading a malicious file. The presence of a 'download button' heuristic further supports this phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/aws?utm_term=minutes+of+meeting+template+word+2013 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416495/normal_5fcf52276cba5.pdfIn PDF document text
    • http://eliyalte.com/36425537691t6wab.pdfIn PDF document text
    • http://vutanari.22web.org/7446677327.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428329/normal_5ff5aeb9d9f19.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/wujelokuwurilut.pdfIn PDF document text
    • http://ig-supportcenter.xyz/pretest_internal_medicine_13th_edition_free_downloadco8md.pdfIn PDF document text
    • http://jasubizajimalep.iblogger.org/97616843708.pdfIn PDF document text
    • http://sidumila.iblogger.org/65757885453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421627/normal_5feb5959724dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_60190deb79c28.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/runuzitexokol/morokuwejefojaketusok.pdfIn PDF document text
    • http://buzawasilugije.epizy.com/70101717893.pdfIn PDF document text
    • http://vuruketunuwu.epizy.com/delivery_hero_annual_report_2015.pdfIn PDF document text
    • http://tobesonev.rf.gd/lugumijinefadibip.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/cnet_com_advanced_systemcare_free_3000.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_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 5948 bytes
SHA-256: b687e9428396428c5a9f04611ae1342ce2c6978b17bbc313e2eaec48526bbae1
font_01_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 10388 bytes
SHA-256: a3c8d0fe7f2d30d5fe433f7b62e7e3d9af6fad69487d3301a70518a940197ca3

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