Malicious PDF — malware analysis report

Static analysis result for SHA-256 f183db1c160c4190…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 00:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41e729ff8c7d85ce0a3ae1e457d3a51d SHA-1: eef93092696a10d61184dc8b23bd3d5278dd8c21 SHA-256: f183db1c160c41902055d8b0f67f652cd1b0669e5db162a47edb5d3a9338294e
146 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to PDFs hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. One of the embedded URIs points directly to an IP address, suggesting an attempt to bypass domain reputation checks and deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://qigoodteam.com/uploads/files/202109060414242574.pdf In PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/satuju.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/wisekotim.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/75703293292.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480957df79---voloxujizesediwidaxexu.pdfPDF link annotation
    • http://spbmedaks.ru/sites/default/files/uploads/98084509456.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ki6dqqas7uesi64vluq4m75g10/donikekupefogajuze.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/boduviduj.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/91289835754.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/zebafomavutojiranovevek.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/89845178931.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dakuxerajav.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/43732710404.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/letunovanajepizevur.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/guludig.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/fidekeleradikeravubikig.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432ef083aa---68568797521.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/24452902880.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/62067302004.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/4423691927.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/tuzugapazofajutu.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/46701887059.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/21930349556.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/36449951569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ghost+world+graphic+novel+pdfPDF 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_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 17708 bytes
SHA-256: 071c21ffc84065672c32492d1880ec98c5b18868d7e9d8aee29c9afcc29e94ec
font_01_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 11092 bytes
SHA-256: f289f3a2fee29f32d52a4e2be6517ceb4a67dcfea5d06075e870493f9001af74
font_02_sfnt_off00013445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1