Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3af8fb25eedf14…

MALICIOUS

PDF

106.0 KB Created: 2021-10-05 03:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b235592ce5eb51575b4c5f4fae0eb553 SHA-1: c84f13bc46b6202468b161fa47c2677bc6fa3190 SHA-256: bf3af8fb25eedf14a1e3a35dcd6e66a6021bbc6bb2d53b7dde602a056105ba6b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a number in a deceptive context. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://chukguwang.com/files/fckeditor/file/27585881435.pdf In PDF document text
    • http://klwas.org/userfiles/images/file/gisokefuzovugamuwaje.pdfIn PDF document text
    • https://network-italia.com/file/13053452275.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/mafadagiluxuxusazaxelab.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/wojope.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/58794623398.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/lowixonurimixulexobaromu.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/58006642085.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16154217347eaa---rozepibewivekilosipula.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/29006119278.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/toraxep.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/nujazodejoni.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/vavize.pdfIn PDF document text
    • http://voijin.com/userfiles/files/5613422450.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/tufekafuzebumojaxuxet.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/dazugolas.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/90543160364.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/42976391189.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/xaruloxegunuwimoxo.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109231631371110.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/33222775941.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/mukadunav.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16156e62d90d61---gebupofojidibenima.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/dalegodimifuvelivevad.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/206o7igcjrmis1n5o7hjb8bbrc/51661497277.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/gigivutikibovowiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=this+is+the+day+that+the+lord+has+made+and+i+am+so+glad+he+made+you+lyricsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elemIn 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_off00013c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000154a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A8 19684 bytes
SHA-256: 390399a88e225944d783f3a8a737f7232107bdc1ac3414dbcb282c2fe121d2e9
font_02_sfnt_off000186a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A5 10992 bytes
SHA-256: 3af5f87a7584445dc434d02b901ea4c3cbe057068f5558c57deba666d7ca54d9