Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75c4f74917435d1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 09:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ecb899bfdb1bc268db6fbad2b643475 SHA-1: 3b21c6eecd30111a30eeae43308f2b2074906f39 SHA-256: e75c4f74917435d17b20e7e37c47d2c68fe22a8a51a184e9bfc53aae7bb9af91
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=wonder+woman+1984+full+movie+dual+audio PDF link annotation
    • http://professional-tuner.at/uploaded/file/vowujiwenox.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/16539872988.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/juletezefofapokejixi.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/91571912161.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091721120545.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210905174548.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/52766545921.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/43108615533.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/dovitatizobixake.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/36630070006.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/48780316245.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/60983857074.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134077e2c3ad---49927844274.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/mufigewoxodunuw.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/gaxegoxinetaferado.pdfIn PDF document text
    • https://polandpools.com/contents/files/6629791610.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/jedajupakiwetutabo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/88734580041.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/68472712467.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/70799670699.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e7e768ba---voredetenazuzorogib.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/bufowurilet.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_off0000c973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 11000 bytes
SHA-256: 542d1311860721aa5ce7feb8eddfd0e9328c8d889eee45cdf2aac4830906eb7c
font_02_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 18148 bytes
SHA-256: 72ebdbe4d2f8252df160313addd2fec5766cfc043b19c76b8e86c3895ef2796d