Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60ba2e8cf6f9d9c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 09:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d9d9b7c1e78a9c2490c6b3c0081075a9 SHA-1: 940c6a1c55cda8c2573c480feccab4e37a00cc86 SHA-256: f60ba2e8cf6f9d9cbff9452d661d3382834c9c68e130520ee669a44843948707
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to redirect users to a large number of other PDF files hosted on various domains. While no scripts were extracted, the presence of numerous external links, including one pointing to a link farm, suggests a phishing or malicious redirection attempt.

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 http://rideabikenews.com/user_img/files/degiwopagi.pdf In PDF document text
    • http://eperon-kochersberg.com/img_db/9822613476.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/vonatedazepur.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/99337593092.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/noxadasemibepopotebek.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/29443158170.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/78230657811.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/30012496719.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/45945107690.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/bofogaxekuwuketevukaf.pdfIn PDF document text
    • https://datenglagi.com/contents/files/29060850969.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2784c507---desulewijovezitejakara.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/2936251365.pdfIn PDF document text
    • https://venus-forever.com/image/files/kenolapor.pdfIn PDF document text
    • http://geasit.it/userfiles/files/6285851380.pdfIn PDF document text
    • http://risme.vn/files/zibine.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396c5fc03cd---13431938504.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/2207462830.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/41737095840.pdfIn PDF document text
    • http://iccarrentals.com/files/file/nukojijenegogugopipedi.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/16549422646.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/jibopulogezuxoteperuselo.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/33892183348.pdfIn PDF document text
    • http://edeins.com/userfiles/file/95042193314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=my+policeman+read+onlinePDF 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_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 18084 bytes
SHA-256: c5bd44da48925eec0522cb19cdb7700cf71e3073877bd0ed0a0851567b1e97d3
font_01_sfnt_off000118c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 10516 bytes
SHA-256: fc71a464974351e8a8de63804339aad1de61030f84f9253258b7a2b83af1846d
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1