Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a96502bd68aa331…

MALICIOUS

PDF

70.1 KB Created: 2021-09-12 12:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9451b09147f17102451dfbf33fdb77a SHA-1: 6221f722a5616a554960170e9f0170f405ae7827 SHA-256: 2a96502bd68aa3312dd190240ce618d522a409f4cfe5dd1e1411a319d289ab9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous external URIs on disposable domains, with one such URI being https://smidgel.ru/uplcv?utm_term=flutter+create+java+project. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://smidgel.ru/uplcv?utm_term=flutter+create+java+project PDF link annotation
    • https://fengshan-zhennangong.org/upload/ckfinder/files/69870393546.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/94555788538.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/63388125483.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/86260608612.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ece5d4f4146fd98b0a0b5c3ce1fdac37/wilukasaverofoj.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109050148078153.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/89326241245.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/bovexusez.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/lugupapawa.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/91887331946.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/wodomirukogepojevetize.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/52350587774.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/99884532247.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/titekoju.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/86507297624.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/dipas.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/34587688164.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/zekam.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090910213250.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/5868976838.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/86707504203.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/62927669419.pdfIn PDF document text
    • https://breedlife.com/upload/files/neveguniwalane.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/90126874767.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_off0000b18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18A 10276 bytes
SHA-256: 06d31360faab1c1ee53b925ec5c55b10a0afb092b4a24d0962c1e410031b39a8
font_01_sfnt_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16456 bytes
SHA-256: 78bc085078d3aefa28bfcb5551db6fa944a49460f033c285a10197d4f9bf4c81

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