Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2fb966a99c4227…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 21:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce27c480919fba42c0bde1eeeb6cd537 SHA-1: 6eae0db95741113bc4edf255c26c870237fba46f SHA-256: 2b2fb966a99c42270a876b9db558dbb39645057067122ecc40ffde65ff1095a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. 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 phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catherine-massage.com/ckfinder/userfiles/files/41412287074.pdf In PDF document text
    • http://trunghungplastic.com/luutru/files/wipexufap.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tuzogixabibuzizewume.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/pomeradotabixizinokudep.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/fisojapodafa.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/23671622323.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/jatujosowosodosuwoner.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/vowevimupor.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16308799471717485090.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219117609298.pdfIn PDF document text
    • http://boldogelet.hu/media/11148421805.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/mobovejumopupenijalaget.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/18571655113.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/51845658390.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/43322562187.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/68581727215.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/zujidiro.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/42902517057.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/livojuzabebexebivafuxuwi.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/bolez.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324dabe107a---sexoseru.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/zajazagarul.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/xamari.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/9591219088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=work+not+completed+mailPDF 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_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 17100 bytes
SHA-256: 1ad1cb2fbd56a4fb9d89b410d5f500bf9e7f2cfe8bb55c423583898a63bd911e
font_01_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 10592 bytes
SHA-256: cf12612c1702d5fcb511145a000e2f16a922a2d1e2e75857615b60a93a66e24e
font_02_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1