Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1fa390780510ad…

MALICIOUS

PDF

67.0 KB Created: 2021-09-14 08:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b258f79f700437d2c734721ffa040c9c SHA-1: a1a5daf33e6639e07506003db55ced9cb13824ad SHA-256: ad1fa390780510ad90363f995d39ba272b63cda232e05d46c4815cd083931da9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_IMAGE_LURE' indicates the document is image-based with a click-out action, a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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 66 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 http://iberryhomemade.com/userfiles/files/bizobifogini.pdf
    • https://rzfmuhasebe.com/userfiles/file/gudokotemamo.pdf
    • http://casavacanzesanvito.eu/userfiles/files/luregixomexiralaza.pdf
    • https://marikakozmetika.hu/editor_up/gowezapar.pdf
    • http://biogenetec.tw/image/files/20210903_142256.pdf
    • http://szolnokepul.hu/userfiles/file/86833442475.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/73038014450.pdf
    • https://ku4ysk-9lgp4y.com/contents/files/81627634466.pdf
    • http://synerfreight.com/syner_upload/images/files/86388169187.pdf
    • https://ever-progress.dacola.com/upload/files/lalosuwedozemovadudezew.pdf
    • http://z-sinpro.com/upload/files/1143951695.pdf
    • http://uptownfallschurch.com/uploads/files/palowiko.pdf
    • https://caribemed.com/userfiles/file/futakebewekodotosotepa.pdf
    • http://videlec.be/ressource/file/62208530947.pdf
    • http://www.deep2001.com/images/library/File/68998132355.pdf
    • http://mobilenmr.com/files/files/10369133747.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/motozodevazo.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/57286528827.pdf
    • http://alfavs.eu/userfiles/file/basopinim.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/variputulonudaku.pdf
    • http://clubsahdianagalati.ro/upload/editor/file/49012335179.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lineage+moto+g3
    • 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_off0000abb3.bin
e575e723fd31751a2a006bd4191d23435f4a69d4d87f76d83f1272c4712a9749		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABB3 14464 bytes
font_01_sfnt_off0000cfb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 16792 bytes
font_02_sfnt_off0000e7cd.bin
c88b3667fe6d9851e355a185499d811366198a0a7b0b373eb01e63f56c2d04b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 10268 bytes

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