Malicious PDF — malware analysis report

Static analysis result for SHA-256 fceb388f3db70f08…

MALICIOUS

PDF

77.4 KB Created: 2021-10-04 18:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 91aa5acfc3a3edf701e73a4f50dd6a06 SHA-1: a1bd36daf5c489510e03ede814537f13b531fcd6 SHA-256: fceb388f3db70f08f3af49ba6a61f95e6481289772e2bf386cb57abae15dd3c3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a deceptive context. Although no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://pistant.ru/uplcv?utm_term=if+the+ph+of+a+solution+is+4+what+is+the+poh PDF link annotation
    • http://wolfroccatiassociati.it/userfiles/files/lotogu.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/74154770290.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16153075834a14---kafuvus.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/depoteziterovotafigupibuv.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10b76f4a2---35917499455.pdfIn PDF document text
    • http://idroter.org/userfiles/files/64883289345.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/81344387527.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/95125387534.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/41670715010.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/vipinusulesi.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0968428001631875525.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/tuguk.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/nezodoxor.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/93833916819.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/wojuzivida.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/24552813558.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/gezulubinifinovojobipib.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/rikuwexopotimarasinawa.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/bejibanuzixiwu.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/51946904790.pdfIn PDF document text
    • https://el-tall.pl/pics/file/zojubotezegu.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/30008997085.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219301722566856.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/pisomitipuxonibigixodix.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_off0000c65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65A 18812 bytes
SHA-256: 18e21287cbe6a80a14fed35ea55e2c17658557aa67e2c30d0611114e1dbb4769
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 10568 bytes
SHA-256: d3b1b6bf626a9e6f26c6ee92cb261b97e37bfc283722afab10c3af6caa3bc30e