Malicious PDF — malware analysis report

Static analysis result for SHA-256 737461cb4f7a85bd…

MALICIOUS

PDF

77.7 KB Created: 2021-03-25 02:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74b23d8a5eb2a4ccde54cfbc67c56e1a SHA-1: 219509d8e67406483f85b84434d978801abb14ce SHA-256: 737461cb4f7a85bd3945bf51f7fb389e825aced34bd0bd52517ac7a599a6ce1b
196 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as PDF documents, suggesting a link farm or phishing attempt. The presence of a password-protected archive lure heuristic indicates an attempt to bypass security controls. ClamAV detection and ML classification further support its malicious nature, likely serving as a lure for users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wix?keyword=roblox+mod+apk+2020
    • https://cdn-cms.f-static.net/uploads/4373519/normal_603ed9b4afffb.pdf
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/8036449.pdf
    • http://erkutungotu.com/the_road_cormac_mccarthy_movie_trailery0ab4.pdf
    • http://2020coupons.info/line_6_pod_farm_crack83775.pdf
    • http://static-get.top/fulawabenipim8hlfb.pdf
    • https://babexunerasosib.weebly.com/uploads/1/3/4/6/134620176/vonoliwebumerizid.pdf
    • https://fovokifijinibe.weebly.com/uploads/1/3/4/5/134582558/vunasavimis.pdf
    • https://tukevepa.weebly.com/uploads/1/3/0/8/130814993/57e86562ee307c3.pdf
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5ff5f1959f5ff.pdf
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5fe00ba01ce3b.pdf
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5fee0f158772c.pdf
    • https://tekofudarazot.weebly.com/uploads/1/3/1/3/131381521/guzewu.pdf
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fe5441df0c6a.pdf
    • https://cdn-cms.f-static.net/uploads/4426677/normal_600e9fff64d59.pdf
    • https://static.s123-cdn-static.com/uploads/4490252/normal_5fee6e3165049.pdf
    • https://cdn-cms.f-static.net/uploads/4379486/normal_6052c60510a8b.pdf
    • https://xosofanukofupa.weebly.com/uploads/1/3/4/8/134879033/23260ba1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bb515f37-0e75-41eb-96cf-fe8923d2cd6f/88480058859.pdf
    • https://uploads.strikinglycdn.com/files/804074ed-9be3-4515-ad66-7e018d8c12f2/susaporinatipuzadul.pdf
    • https://uploads.strikinglycdn.com/files/22523833-e533-4d0b-b72e-c282c0ecf369/black_and_decker_grass_hog_spool_winding.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e8.bin
eb3a8a92d7087f304d19f8f32760ba4217f8296627735f514a01882652e39135		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 5384 bytes
font_01_sfnt_off0001032b.bin
980003bbbc1a340669e98a8e22c2536d0ffcf5b43c8f9903f530c60f7cb761c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 11452 bytes

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