Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9a2a8c34574000…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 02:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a263248bf2c7fa42fe59dd40be30324 SHA-1: e657c743bdad550af156bf1a31d33f1520aef09a SHA-256: cb9a2a8c34574000bf79865621c2bd0399b56039ad88627a84ea966f052e4a29
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for distributing malware or conducting phishing campaigns. The PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=android+studio+failed+to+install+intel+haxm PDF link annotation
    • http://citranco.com/users/files/lolipoposemusawupa.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/3785060692.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/259519745.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/20867626544.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/26021495994.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/sesitizuvula.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/66272770662.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/tivobasupufosozekek.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nuvipugewagademo.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/94591637665.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/sonajuwuxikifujinejuniv.pdfIn PDF document text
    • https://arerp.kr/data/file///gazopexukigixod.pdfIn PDF document text
    • http://rrarental.org/upload/file/xijuw.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/fufas.pdfIn PDF document text
    • http://korytnica.net/data/files/24463835259.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab509e330---dunafewijemoneritaroje.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/sekunefuwefapevujan.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vudirezudisozosipat.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/srmstg639mn6kqsahrab1gshpt/ranuvonovuvim.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/12792674200.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/90210961300.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/vazexaseje.pdfIn PDF document text
    • https://petek.biz/resimler/files/kapiwegurinenujobaja.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/lagizasilajoto.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_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 18064 bytes
SHA-256: 2dfed269c1c6133c6db35eb8711a23eed5d39271273e598a31ba93b477c27c5e
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 10804 bytes
SHA-256: 1d7bb6454e10d6a39f685716bbc2cbf5b99249e2047851f2245490479ff4f4a8
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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