Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c25d121521a000c…

MALICIOUS

PDF

96.1 KB Created: 2021-09-18 10:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c1349ccf669564e37243c0319ef7831e SHA-1: bab2f9b57273c3aca00de21cf4f489589d70dc66 SHA-256: 3c25d121521a000cbebdfa1693c21eaa16b29f4168ec89704ade325b99f4c0a7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a callback phishing or tech-support scam. Heuristics indicate it contains external URIs and a URI pointing to a raw IP address, suggesting it may lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and associated heuristics suggest it's designed to trick users into initiating contact, likely for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jagdrevier.hu/upload/images/file/sofedutofawabereriwalifi.pdf In PDF document text
    • http://soles2walk.cz/data/file/jitetoperadisaro.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/kezabikegerigodul.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/78930227042.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/dijogamivapotas.pdfPDF link annotation
    • https://hoangvan.vn/wp-content/uploads/files/zotefejusajiniro.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf80aecdb---78801229514.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210918_144634.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/39503657083.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/34233592936.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/gesejatesuzotikadisi.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/lopipuluwi.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/18/file/20210918_083216_125.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/bebagulaf.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/saroj.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/59436465695.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/wojamosisogeken.pdfIn PDF document text
    • http://pileki.com/imgup/file/43026878978.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/bakekubipefamusuxapezusa.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec739e1e72---92186655273.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/gawebodatififuk.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/11741895953.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/55173328797.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/bafumekilavesat.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/42861642551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lucky+chan+yum+chaPDF 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_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 10000 bytes
SHA-256: f065404bdbaa96561d7814747a66c3c09cce1d5be68a6629aef6557a734a7647
font_02_sfnt_off0001350a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350A 23800 bytes
SHA-256: 220ff9a10ad8049bdf0ba823dd982adb1696ae29664b62723eabc22f4e0d580b

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