Malicious PDF — malware analysis report

Static analysis result for SHA-256 f554d84837c3deda…

MALICIOUS

PDF

68.1 KB Created: 2021-09-21 15:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4d03e95ed92a40fc2ce29d03e4af3d5 SHA-1: ce437b2c0b07141772fe1598377f1c920aae2321 SHA-256: f554d84837c3deda765d331061b992f486d2054c5e2d18729701ffa7fbb91b3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination or distribute payloads across many domains. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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://drafthe.ru/uplcv?utm_term=com+sec+android+app PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcca66ecff---wizaxupevotenobomunad.pdfIn PDF document text
    • http://innotack.com/userfiles/file/42338449953.pdfIn PDF document text
    • https://synersys.fr/contenu/file/dapipajixolodiwivif.pdfIn PDF document text
    • http://hocomesun.com/upload/63054330381.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/9033014048.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/tubapogejusujati.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/50570222093.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/rivisu.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/mezulamegum.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/teleripimiramam.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/34661530344.pdfIn PDF document text
    • http://suma.ca/upload/editor/file/welajuda.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/xafeja.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/93118364402.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/32075752178.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///94782236829.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140c3e4735b7---jiwebijubol.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/19817059512.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/fotus.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/gexugesasowu.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/medulupuxaditidu.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/nebajifena.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC605 14872 bytes
SHA-256: d8ef8508ec2b6d358a8473846dc1026eda9b7a0101d2312a71902ec1a8e98ceb
font_02_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 10564 bytes
SHA-256: 8e0a254da4a44d914813f34c0eaab993763ec11b06261f5c362272eeb06dcaf4

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