Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c043eaeaf6d98c2…

MALICIOUS

PDF

61.3 KB Created: 2020-12-24 20:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 18702554d7eccca5d4d15cd49630dda2 SHA-1: eb6516ecf7178a71885ef268589316f921d5e5fa SHA-256: 8c043eaeaf6d98c2eaa27a52c51122e5b2edef8a5799f63bbcffcbe2e27dfb0b
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text that appears to be a lure for a video, likely to entice clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/aws?utm_term=baaghi+video+full+movie In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480408/normal_5fe44775afb05.pdfIn PDF document text
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/ramizun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368732/normal_5fc4b06e11a35.pdfIn PDF document text
    • https://volexerakonoza.weebly.com/uploads/1/3/4/7/134713377/pijogeludod-sujozes-kaxij-lagolitupa.pdfIn PDF document text
    • https://cdn.sqhk.co/lepitajirel/djegc8s/pasemupesuxakijunubiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480581/normal_5fb3e96d6cdd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fadad4bb749e.pdfIn PDF document text
    • https://basivukapipex.weebly.com/uploads/1/3/4/5/134528325/507d9d0.pdfIn PDF document text
    • https://bekawoxe.weebly.com/uploads/1/3/4/5/134529307/913985fbad.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/puJqhaq/falubezov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/964ce788-7708-4e9c-970f-11fcfd31d60d/cold_war_images_high_resolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4994421e-0c02-4f87-b48b-dfefa51beab8/jarebej.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/insurgent_full_movie_online_free_no.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_off0000b280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 5156 bytes
SHA-256: f098b55d7ab3d3bab1d49b8d0664fa89812959bb3d55ecda8ce58c174ca6d52a
font_01_sfnt_off0000c3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F5 10292 bytes
SHA-256: 86257c5e38a4858ee4cfd0f576c91da7f4718f0081ce64401c9813ef817219eb

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