Malicious PDF — malware analysis report

Static analysis result for SHA-256 86034eae32b7f324…

MALICIOUS

PDF

69.7 KB Created: 2021-09-16 06:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91df5b15e485eb41b485fad2aa4035a3 SHA-1: c26b1fdb7a255399c351383b462415291280b425 SHA-256: 86034eae32b7f3246ea4b5ba104b5e97ec2d9b8eabb7f763be80d4310c6d49b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on low-reputation domains, likely to distribute malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=android+callback+interface+example PDF link annotation
    • http://madinaboys.com/easydo%20v2.00/files/uploads/15768994826.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/kiwibixu.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/bugup.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/wapasositibavojalit.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/pifupiwuxijebevezu.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/57685656198.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/57517515028.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/zuxazifawadimafixuzoxu.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/47377070353.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109040649077087.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0ac31aa5---lelatinalavena.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210915142722_bggxye.pdfIn PDF document text
    • http://artio.pl/files/files/14806259622.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/44879059179.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/8944930382.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139a95a5b92a---rananakobem.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/51820785211.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/28425787076.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/vudelomefumirota.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/dekomedirukiwuj.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/fizuw.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/tagofusamo.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/140211467856.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_off0000b05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 15884 bytes
SHA-256: 45a98abb4216757ff0bc38c183cf5af55fa5521cabc67ecc63db839c1dde4456
font_01_sfnt_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 10928 bytes
SHA-256: 4a478028469d128f3781e4245193dd237eae07b5e67214007c8026f6712cb634

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