Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3e98cd309cdc7c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 16:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d7ad4786012101e853f1459e2d7314d SHA-1: 4f7d91e90a91a20b81afbfbb0f58f51b1198acc9 SHA-256: 8f3e98cd309cdc7c229148baabf4b5023c67ebe2388f9d1bac66ffb7d7e15d42
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious sites, and a heuristic identified it as a link farm on disposable hosting. The presence of a callback phishing lure suggests the document is designed to trick users into interacting with malicious content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=simcity+buildit+mod+hack PDF link annotation
    • http://zssadkowice.pl/pliki/16708062953.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/kagefufirewikefuk.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/56140353707.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/83426724173.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/raderufibipobeterolaka.pdfIn PDF document text
    • http://headrepublic.pl/images/files/72805689771.pdfIn PDF document text
    • https://jin-ji.com/upload/files/zomibasupob.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/zakopesoworekekudune.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/61117666756.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/makowurukilorugawe.pdfIn PDF document text
    • https://el-tall.pl/pics/file/zetipivalevoluxibipibe.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/48304483810.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/11324084180.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/surilajotumepadewaze.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/9534507921.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/54435673225.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131889c6b2d7---53324185189.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/33511333198.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/dutorusumapipasuzurutesil.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/87783701492.pdfIn PDF document text
    • https://endobible.com/userfiles/file/48067749741.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/sumemejomako.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c97a04593---rawifalixek.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_off0000c12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 10652 bytes
SHA-256: ca00962bac0017909120b5f7bcadcbcde66bce493a01104ad60e1fa49d31c5e4
font_02_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 18372 bytes
SHA-256: ccb648c866af887adf879b64d8d5039d00181e7003c747e570df778fcfd42c40