Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a829402171573c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 07:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1d95b35d1a1cda17547eb32bf08c1700 SHA-1: a7c53a39e3b438e1494e72603898de8211f618b6 SHA-256: 67a829402171573cb33ddb718221f2d4aeb591f09376d2bc59984d31ea1c137f
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 or trojan. Heuristics indicate it functions as a link farm and employs a callback lure, prompting users to call a number under the guise of resolving a billing or refund issue. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest it's designed to lead users to malicious sites or initiate fraudulent phone interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://synerhu.ru/uplcv?utm_term=vidmate+2019+music+download PDF link annotation
    • https://onderdurdu.com/upload/ckfinder/files/19429506091.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/76651898543.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/74476803193.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/gebowamusujomuviweg.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/vufare.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/37370155978.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/wuwakibozubu.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/judemofuzobumubera.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/94289272.pdfIn PDF document text
    • https://maria-galland.ru/files/file/neneje.pdfIn PDF document text
    • https://peterdegendt.be/file/bowumabedozonido.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/mowapatukikomupil.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/zotejirusexizirukomij.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/xepopobo.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/98897653670.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/tofirewobuxelu.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/310760692.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/dotidazemidepumesoludaz.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/12566708684.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/89742792165.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///wutezeluwixemesasil.pdfIn PDF document text
    • http://www.bash.cl/media/file/86178327647.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/89033520435.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/18580226747.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_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 11048 bytes
SHA-256: aea3526955b521cefa9e5dce9abc33a0f8edd8ad30e35fe82cb42c415cd45c8b
font_01_sfnt_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 16240 bytes
SHA-256: ee239ce69cff4af9ed9ce2dcc1b8df0898553e995dc669c36d118ebbba77fc17
font_02_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1