Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c3138396c27f06…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 19:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a10015d14de1b99d6512f5fdafd9cd28 SHA-1: 9ce97a0db8808da48b94703af3a95f739e4f1257 SHA-256: 01c3138396c27f062fa63b9ad40e90e6da7b45389dd9488c150f232bbcbf4ad0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable actions pointing to external URLs. The heuristic PDF_IMAGE_LURE specifically indicates a screenshot lure, common in phishing campaigns. The numerous external URLs, many on disposable domains, suggest a link farm or redirection infrastructure for delivering malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://medvor.ru/uplcv?utm_term=icon+for+android+phone PDF link annotation
    • https://dollarplus98.com/images/upload/files/7977609944.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/jugozesulajifupasebubu.pdfIn PDF document text
    • http://centronegozi.com/public/71952474292.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/lerimozexo.pdfIn PDF document text
    • https://semut73.com/contents/files/nezekusanekuvanezufowozi.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/6024049371.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/23818551048.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/ribaku.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/6790850458.pdfIn PDF document text
    • https://theipbuzz.com/images/file/nuxubukivaduzita.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/60372372043.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/telujeforemel.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/17551357484.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/54898941101.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/pulivijel.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/kanovizowobo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/89613236250.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/88902095772.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/vikunugagujibepazufeza.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/wimuti.pdfIn PDF document text
    • https://duel.pl/userfiles/file/tuserevixanojexawirowexef.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/61364629690.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/92948336123.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_off0000b09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 10356 bytes
SHA-256: 3ac4ce4122eefca784d3842bea31953a21a259f59940ba06d20dee1f0d8b953c
font_02_sfnt_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 14352 bytes
SHA-256: 2ed9ac049e53d5a2ff37986799fdd90d55d0b8ad0ed73470b29dfc5b3b75afef