Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caf7d71fe8f188a…

MALICIOUS

PDF

77.1 KB Created: 2021-03-11 17:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93f64996c554ef9c178bd3aa224844d7 SHA-1: 751b3f379a1b89d5f5d1150acb17afd85ac06f0b SHA-256: 6caf7d71fe8f188a8f688f7c0dd6d3657a2b716e495492b8e401d8bc541b6785
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating a link farm or redirection mechanism. The primary URL, https://seumenha.ru/award?keyword=pdf+annotator+android+tablet, suggests a lure related to PDF annotators, potentially leading to phishing or malware download pages. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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/award?keyword=pdf+annotator+android+tablet
    • https://japugaze.weebly.com/uploads/1/3/5/2/135295186/1692950.pdf
    • https://static.s123-cdn-static.com/uploads/4392451/normal_5febb75ddd2cf.pdf
    • https://taralibupub.weebly.com/uploads/1/3/4/3/134372711/1147944.pdf
    • https://cdn-cms.f-static.net/uploads/4370059/normal_6016c7d833dd9.pdf
    • https://static.s123-cdn-static.com/uploads/4379485/normal_600277846ec08.pdf
    • https://static.s123-cdn-static.com/uploads/4417313/normal_6005a290b9e03.pdf
    • https://cdn-cms.f-static.net/uploads/4391636/normal_602de8aae565b.pdf
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fd11b8a140c0.pdf
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fe901732901b.pdf
    • https://cdn-cms.f-static.net/uploads/4460725/normal_60445b50783d7.pdf
    • https://cdn-cms.f-static.net/uploads/4476436/normal_602a78ba46802.pdf
    • https://toxodomof.weebly.com/uploads/1/3/1/3/131384531/kudutoretekosa.pdf
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5fec6a0057d30.pdf
    • https://wajajudamivigo.weebly.com/uploads/1/3/4/3/134359543/4269558.pdf
    • https://cdn-cms.f-static.net/uploads/4455672/normal_6036241f795ef.pdf
    • https://static.s123-cdn-static.com/uploads/4381095/normal_5fed6d07724bb.pdf
    • https://sidatenut.weebly.com/uploads/1/3/5/3/135349940/donufakovogal_fozatu_pamawixubasini_watadogude.pdf
    • https://cdn-cms.f-static.net/uploads/4410018/normal_60327593375ce.pdf
    • https://cdn-cms.f-static.net/uploads/4410204/normal_601d366091049.pdf
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/wobesa_ladoroduwuso_vokexidi_lufizemap.pdf
    • https://static.s123-cdn-static.com/uploads/4408172/normal_600271a704e66.pdf
    • https://cdn-cms.f-static.net/uploads/4413011/normal_6021995fc576b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f3b6.bin
2a7fe03dcddd815ec27bbded0a11b4eb8c0319609e9c5443d2a30f22637438d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 4864 bytes
font_01_sfnt_off00010450.bin
4072c1a0bf725271ccb7c5dfef2906931cfa5617777f03c89cf1ba74c2cd826b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 10164 bytes

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