Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d41ab26ebc0026e…

MALICIOUS

PDF

73.7 KB Created: 2021-01-21 11:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8816b5de1590d861963a3a7e3a117db1 SHA-1: c61bd063edcc9f7814b7e9e23ade1bc01b4326a1 SHA-256: 8d41ab26ebc0026e071bc7c5fd181e0a79e3879f96a8ed040ad3536a6865fbd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The primary URL, https://seumenha.ru/wb?keyword=bounce%20back%20lyrics, appears to be the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/wb?keyword=bounce%20back%20lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457868/normal_5fe7727ac4df2.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/gosikorezoluw.pdfIn PDF document text
    • https://site-1171771.mozfiles.com/files/1171771/xonoxibadutukoxagigali.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/799d101.pdfIn PDF document text
    • https://site-1176940.mozfiles.com/files/1176940/7388519791.pdfIn PDF document text
    • https://site-1176597.mozfiles.com/files/1176597/modern_language_aptitude_test_answers.pdfIn PDF document text
    • https://site-1168052.mozfiles.com/files/1168052/64880660480.pdfIn PDF document text
    • https://site-1254705.mozfiles.com/files/1254705/asplenic_vaccination_guidelines.pdfIn PDF document text
    • https://gagopono.weebly.com/uploads/1/3/2/6/132681316/1ce8cb30.pdfIn PDF document text
    • https://site-1246924.mozfiles.com/files/1246924/5845555437.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipudovisubu.rf.gd/gazeta_shqiptare_panorama_ne.pdfIn PDF document text
    • http://zezajezo.epizy.com/xetukosegavowade.pdfIn PDF document text
    • http://bajewilogofiro.epizy.com/clinical_guidelines_for_liver_transplantation.pdfIn PDF document text
    • http://vazorilumi.epizy.com/22411679961.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/asus_tuf_fx505dd_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_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 5148 bytes
SHA-256: 17424e1e9540a7b6f5ff6894fdd6ab7f4c949e0c3c8a5f781f1bbf785a73affd
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 10472 bytes
SHA-256: d5283df3fba7cc532e7af2a035f3c198e152e0661a299fbaec6d373f1843f4d4

Open this report in the interactive analyzer, or submit your own file for analysis.