Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bdd394f445b0e9…

MALICIOUS

PDF

83.7 KB Created: 2021-03-09 14:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e9fba178309d22d65c12fe2d7162261 SHA-1: 5fbe2e0d918ac87a466ca9b873f6c71e0c070fd3 SHA-256: c4bdd394f445b0e96f3b6eae988c7d0aa2bddb9ca0b457872aa859a8ba3a1b90
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm for SEO manipulation. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The presence of ClamAV detection and ML flagging further supports its malicious nature. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=android+model+a574bl
    • https://cdn-cms.f-static.net/uploads/4446931/normal_60101eceb9da0.pdf
    • https://cdn-cms.f-static.net/uploads/4489407/normal_60290c3e95318.pdf
    • https://cdn-cms.f-static.net/uploads/4379969/normal_601d05fd9e4b9.pdf
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/setaluvitege-lovisijix-zuxefo.pdf
    • https://wurivebufe.weebly.com/uploads/1/3/0/8/130874680/sisexat.pdf
    • https://cdn-cms.f-static.net/uploads/4502188/normal_5fd65deda14bd.pdf
    • https://static.s123-cdn-static.com/uploads/4469847/normal_5ff9c56d0a125.pdf
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/3025001.pdf
    • https://jenazikefu.weebly.com/uploads/1/3/4/0/134017187/7519812.pdf
    • https://sewokowoxukipa.weebly.com/uploads/1/3/4/8/134846336/935190.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_610cb6b5bb1743f4a3c0aecedabaf82a.pdf?index=true
    • https://s3.amazonaws.com/sorapobuk/mavosoxaninunupobiwigut.pdf
    • https://uploads.strikinglycdn.com/files/c0d75f86-25dc-4e65-905a-cb6a3a1b91ca/srimad_bhagavad_gita_gujarati_audio.pdf
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_d25fa6937ca54613a640f3461eeb7bbf.pdf?index=true
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_b03499679bd24891b6fef07199cf2ec2.pdf?index=true
    • https://s3.amazonaws.com/kefefetafij/kanokilunawoxowajowejeteg.pdf
    • https://s3.amazonaws.com/sedimeraxufi/katoen_natie_annual_report_2017.pdf
    • https://uploads.strikinglycdn.com/files/1e613d1c-14f3-4762-807e-eda82d431c00/bijirovexodezi.pdf
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_c297920dab9e4b6ba67638897acd0b74.pdf?index=true
    • https://uploads.strikinglycdn.com/files/33743abf-aa04-408c-a4d5-aea06091c50d/39901924713.pdf
    • https://s3.amazonaws.com/bokexizometun/87058274648.pdf
    • https://uploads.strikinglycdn.com/files/300a9b9a-7513-475b-a231-7c7debf8a55d/1854244197.pdf
    • https://uploads.strikinglycdn.com/files/8777ad40-784b-4957-a756-f72fa0896244/monefuzam.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_off000108a0.bin
3025718cfdbab28e3b8f60fe74dd46848a0ac24ffeb9c1fc25545840a6de7423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 5212 bytes
font_01_sfnt_off00011a53.bin
1c8174a1fec7dfdb356d2b23d84746e55fe788cb3315b27ee9385b477f9823c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 12180 bytes

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