Malicious PDF — malware analysis report

Static analysis result for SHA-256 544138c183cefdc1…

MALICIOUS

PDF

78.5 KB Created: 2021-10-06 16:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: efa83c138bffc1baa56bdb76db27fbba SHA-1: 2462e5b089a04121fb9226eb1d84fdeba93cbc4c SHA-256: 544138c183cefdc1f87395e243ab261d420cdaf4a6cdf183fe0240de67637c45
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to manipulate search engine results or distribute additional malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aihyang.com/userfiles/file/dudonodulosegirasize.pdf In PDF document text
    • https://luckyfood.itweald.com/uploads/files/615d2e3d7be6b.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/keritekabuvudelija.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/81484596760.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/42715477826.pdfIn PDF document text
    • http://byecook.com/ckupload/files/20211656245.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/wusepir.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/26380954161.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/sifosobo.pdfIn PDF document text
    • http://dd-eng.com/files/files/widasonol.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/vimeloxonemopabidaruxoto.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/vugefekalulufenalekave.pdfIn PDF document text
    • https://x-software.cz/data/file/62666656994.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/tesiwivowinevosuxoku.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/39677255844.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/biduripanig.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/82541032764.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/tojoze.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/kajenibexulefaguxoxiv.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/8061105942.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/nofugi.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/liwiwesab.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/rogupolo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/degoxatujelujetuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ghouls+bloody+night+codesPDF 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_off0000c5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FB 20612 bytes
SHA-256: 7c3bc038560f2faf9e0c4846984549282624f99359e3caa0f32fe5329f39d817
font_01_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 10780 bytes
SHA-256: 2b70f535aa790fd4aed7624b291f07469f051c63233196c7aa4b4a59dd3cb62e

Open this report in the interactive analyzer, or submit your own file for analysis.