Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdefbfac295cf071…

MALICIOUS

PDF

69.6 KB Created: 2021-09-17 19:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b92170ad48b88091a34edfd72353001 SHA-1: 93f28e2b85397d37ef63214e187cf178aef05634 SHA-256: fdefbfac295cf0710e9c17c9f7db2a3d80c8ea6f24dd1464d99f52de483bcb1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous distinct URLs hosted on various domains, likely to obscure malicious intent and distribute further payloads. The presence of multiple unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • 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.
  • 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://pinzimoniofiumicino.eu/userfiles/files/fuselimez.pdf In PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/39773490060.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/27965961840.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/45583517595.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631360657.pdfIn PDF document text
    • https://proxus.nl/file/revavabenolojafodelabob.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/gebateviwora.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210910_1F8F3741D99DC183.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/gagakap.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/42060642821.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210908221136687.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xununapojimovoteduwuni.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/kofenopozalaketujovod.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/ruvuxukofomosopasila.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/70947525684.pdfIn PDF document text
    • http://ergakiland.ru/files/files/71440947243.pdfIn PDF document text
    • https://tebra.si/userfiles/file/97311712606.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/44912603856.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/topuwivasekobalezekexa.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/89092947117.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/21291792766.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/pevovezufememov.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/96722010552.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139854759d07---65153929906.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/genodo.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/16166633299.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/nanapavetas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=random+io+gamesPDF 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_off0000b310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB310 15312 bytes
SHA-256: 4cde73816d4540b8814c93266458413958d942a3e9c6df73a66f5dfbf1dee249
font_01_sfnt_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 10392 bytes
SHA-256: 98b2e6387d38bbdd36db044275816356625ea4f10b7abca995e50f71ae6880a5
font_02_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1