Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ccdfb2411ec08e…

MALICIOUS

PDF

88.9 KB Created: 2021-09-21 06:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4cd358dce70ac7af1395fec43c87f3a6 SHA-1: cea8bbefb6c7991c038897d7531509e71bbf8e7a SHA-256: 93ccdfb2411ec08ecd83efeffd8f6ccdd0ea7384553d9f31506e5b2897711bba
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure by prompting the user to call a phone number. The document contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. No scripts were extracted, but the presence of embedded URLs and the callback lure pattern strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://lube-stc.com/ckfinder/userfiles/files/posovusapo.pdf In PDF document text
    • http://glampingcaravan.com/userfiles/file/20210905061934.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a794ab6d---julugewofusabefub.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/wofanawuxapenimuwo.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/fibup.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/45135334002.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/67265245129.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/nudopubarazibakagosi.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/66329998764.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/34670984657.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/ximapugugudetidu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/14625851806.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/65799366935.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/56715285955.pdfIn PDF document text
    • https://hgb.se/filer/file/suwopikajemidajugodelanim.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/27331259695.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/17962422122.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/fosulamuvopu.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/84568568515.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/65498312071.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/pilunozaxakotu.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/favewagazexi.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/wopikakoxesepudoxujibu.pdfIn PDF document text
    • https://aaaxxion.info/images/file/kewose.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/8482430548.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa8f964c5---46905012879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=candy+crush+apk+hack+modPDF 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_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 17048 bytes
SHA-256: 97c535181b2a8eef36f234fb40065307919ffb0601bb6a7de90e9b3f084496ac
font_01_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 10748 bytes
SHA-256: 4ca0d2e6e613950f31ca499d958d616e228e6b5776d3988b5ed19cffe69a6ee5
font_02_sfnt_off00013df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1