Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf98697654ff513e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-20 10:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18eaff44f26e3f774e4dc6caacd23bb2 SHA-1: 4f93ab077cf695c2aa7eacb69da5ffd9fbb14d64 SHA-256: bf98697654ff513ee0f52511849acdb312ad98b04999796e65bf5b348fea8248
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm, embedding numerous external URIs, many of which are hosted on potentially disposable domains. While no scripts were extracted, the structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6294e439da4345024f8afcace3f03779/2122895547.pdf In PDF document text
    • http://ktai.lmg.jp/upload/file/dovikakawe.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/jegewijimotajise.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432b07692c8---losekoj.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/61899534293.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/152353172945.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/9629216846.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/moladaj.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091407490779.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/86741159647.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/74538610258.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/5797352355.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/jezisotipu.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/94209751184.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/45954648489.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/sutofotadebizuzurejujob.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/23629009426.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091402472773499.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/kalanokowozigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=excel+convert+to+word+onlinePDF link annotation
    • 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_off0000b325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB325 10268 bytes
SHA-256: cc35b8ca4f0558b489d922354d85fec0aca6a65d48fcee3ae8d06875b90ea520
font_01_sfnt_off0000ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 15704 bytes
SHA-256: 57bd529b123f28eced407518e7f4ff359ef89d4cf2f217756cb3ebf774badc9d
font_02_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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