Malicious PDF — malware analysis report

Static analysis result for SHA-256 c116c290c2f85e18…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 07:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0c7f89fee668ddeb91b7542c1262588 SHA-1: 146df24a0653558d6be7c2b8dc62e56cd622095f SHA-256: c116c290c2f85e182867d41e83ea82a95e1a11a27e771b399438b422f743d312
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm and a callback phishing lure. While no scripts were extracted, the document's structure and embedded URLs suggest it is designed to trick users into visiting malicious sites or initiating contact for fraudulent purposes. The presence of numerous unknown URLs further supports a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://madveras.com/ckfinder/userfiles/files/raxoma.pdf In PDF document text
    • http://tw-sincere.com/upfiles/editor/files/51880631592.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/41797609935.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/58597163181.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiwiguxowetoxuboxabu.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/97552977215.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161354be2807af---sepebazosisi.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/bakaluwivitufim.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/36612302353.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/datono.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/nogelezibewasobezemegamir.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/zasugekajalakapugotudoro.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/62325373553.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/69679520701.pdfIn PDF document text
    • https://tessuno.com/upload/files/61320c02a3e7e.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/lovodelokojipubu.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090804301873499.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/86406020648.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/17091252641.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bakigedub.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/wupaf.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/gatakesiwogixopoxerebe.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/91541768570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=no+root+espPDF 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_off0000ccc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC6 9816 bytes
SHA-256: cc9a23141f3b3f19cd14643d91ab551d2f68b1f56c3a55f45a084bf672b5478b
font_01_sfnt_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 20540 bytes
SHA-256: 40bc147a147754a0dae5fd8d92c3584168cc86a07e88ceba9d4a27a6e99174a8
font_02_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1