Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc635431d877ada…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 16:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0ca94c8bb32d2ec7be67bb35f7f966a SHA-1: 66c95292c0b8129ad773dcef59ce77f23636aba2 SHA-256: abc635431d877ada2bf4ae30cdc7c07d39fbace96ca1d40ea3beb1760a950951
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. The document body, though truncated, suggests it is part of a lure involving lottery winnings or parcel delivery. The presence of numerous external URLs, many pointing to potentially compromised or disposable hosting, further supports the phishing and scamming intent. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://wietsevoermans.nl/ckfinder/userfiles/files/vumixesopufirugejedi.pdf
    • https://tattica.byespresso.com/app/webroot/files/upload/files/6959706832.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/66745673476.pdf
    • http://jysfh.com/upload_fck/file/2021-9-14/20210914094440761164.pdf
    • http://zekidilektekstil.com/images_upload/files/gijafevakubu.pdf
    • http://gartenbaukoeln.de/uploads/files/vujevopisubakexupaparur.pdf
    • http://www.cafeinca.com/img/public/contenido/file/setaxuxarozixibazarivurel.pdf
    • http://kachelofen-prommegger.at/fotubevupiloparanudedowal.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613f93273a0c8---48381160572.pdf
    • https://tapuionoticias.com/ckfinder/files/jexagazodiriwi.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/90292780700.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/wizadisowala.pdf
    • http://www.cerathai.com/image/upload/File/94472951684.pdf
    • https://dveropolis.ru/upload_picture/68772541174.pdf
    • http://abwclayton.com/uploads/files/sipasudemoniterexebenoru.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/1442306152.pdf
    • http://cpk.by/ckfinder/userfiles/files/dotobatununewub.pdf
    • http://zenobiacultura.it/userfiles/file///reziwosejujuvezalazosu.pdf
    • http://abwmountvernon.com/uploads/files/14374055813.pdf
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wijapavot.pdf
    • https://cobrawire.com/userfiles/files/43474890133.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/34771234956.pdf
    • http://xiangzhuan.tw/upload/files/31967622755.pdf
    • http://usairsprings.com/userfiles/file/33375714562.pdf
    • http://sedaciesupravy.sk/media/file/gosagudigabupofabusawuxuw.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/verapebuwobizufuje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=share+box+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d957.bin
991a05231fae7ee5788bb94cb47a323eeb28c1738a70c3732448b9570be16827
pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 10252 bytes
font_01_sfnt_off0000f04c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 16792 bytes
font_02_sfnt_off0001085e.bin
0526a8b8632d195fc8bb6e5ef24ed496345a5cb88f52cae2b0bfd8ca6e05cf69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 21176 bytes