Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7474f752c2ecfe…

MALICIOUS

PDF

89.8 KB Created: 2021-09-22 09:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d095674494efaaf8f1acd8f76f2022f SHA-1: b36e80a58a096108f26d568bd8836b100a4dd4cd SHA-256: 8e7474f752c2ecfe02a98e1d46bcdfb3f1b7547d7dd8322dad89be1d8064b10c
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of external URIs and the 'link farm' heuristic indicate a pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.santamyoga.be/images/file/10442211910.pdf In PDF document text
    • https://cabsfromheathrow.com/userfiles/file/lakerutopobezokobu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/73733532262.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vakopajabiduxiborijidafe.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/78143979582.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/rimajivuruwoxilevelevuvik.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/paloxaxixiwelodiva.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/90907141413.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/96940830061.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/63859146697.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/11395177118.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109020726456241.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/zulifusafabe.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6gt7jn0p568tq3mvenbvi0vhhj/ropazi.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/6553166801.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/balobabikokakagotojuvasem.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/45020574263.pdfIn PDF document text
    • http://hmed.vn/upload/files/jukonemolosow.pdfIn PDF document text
    • https://timminsrenovations.ca/file/WCxUbNLt4AYbaF4X.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/9179222832.pdfIn PDF document text
    • https://suruburi.net/mm/file/29411679478.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/42821897412.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/26892342870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+alpha+sapphire+randomizer+romPDF 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_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 18744 bytes
SHA-256: 2c9ec45464f3f95585ba3b77fbcca7377b932c493ba4430a16e1a24cfef56da5
font_01_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14160 10712 bytes
SHA-256: 4eebeebf24ea6c248916073ce2cb7b423f17008666d5338a19002f2d7151c6be