Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e08cddbc455717…

MALICIOUS

PDF

83.5 KB Created: 2021-10-05 19:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9281807aad088434538917f1cef87db8 SHA-1: 79f6f8f732b3ad83b035dc1042a2e49d7b860d8c SHA-256: c9e08cddbc4557172388e426abc37e94857cffc8cd551d42315b12029785b03a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with at least one identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://crewmak.ru/uplcv?utm_term=corn+chowder+with+evaporated+milk PDF link annotation
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fa1439f027c37ac32ed9ee9e79030810/1418257525.pdfIn PDF document text
    • https://mollis.rs/files/50112552509.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/64489179588.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/kefezoravibet.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/wurojudijufeve.pdfIn PDF document text
    • http://hocomesun.com/upload/mazidovuzimopufaragelavo.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/raxosudaturotemasotek.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/ruwura.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b36ba7ea0c---zenonakofekituwozalalutot.pdfIn PDF document text
    • http://premo.at/userfiles/file/nigetumozugiperufedetig.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/tezudurisesipu.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/pijaxalugaxare.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/mijosafegugigimibiw.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/bexesinujidolibatonumewis.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/12370174468.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/58310718835.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/taxunemimegubim.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29578188067.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/62911386282.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210926_4F3C8E590FD8FE17.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/87342533976.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/logijibuzu.pdfIn PDF document text
    • http://kccmaul.com/files/files/16590881950.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/80209113367.pdfIn PDF document text
    • https://ssangyong.adasenotomotiv.com/userfiles/file/98388950039.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/56206283455.pdfIn PDF document text
    • http://www.moyekolodin.com/files/8745286287.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_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 18788 bytes
SHA-256: 112c4af14e4ff4bb4646cb5d2aae0773342fab9029136a4eaffe667db53faf1c
font_01_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 10884 bytes
SHA-256: 93ca4349a09d354de211f5c4594726d6305d6dc87b1b54a716df78174d4f3ca9
font_02_sfnt_off00012820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1