Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07927fd8a7575bd…

MALICIOUS

PDF

74.2 KB Created: 2021-09-26 15:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 557e70ae6865d21174ca06352c028cae SHA-1: 431d84faa674b1fe3c01c05b5ec2291dbe0d989d SHA-256: c07927fd8a7575bdc45b6fed90e94cec84ef6d14a4076d5880c4f4f6e1711eb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to external resources, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.beverburcht.nl/upload/files/91023955913.pdf In PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/50986689267.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/zujez.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/57573128866.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/gewigunolosarutan.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/98646288310.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/44732369314.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/lulovobexaw.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/bowoporizovetuxudenexu.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/muvetu.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nedagolokanerusubidugi.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/jonibaradutadegumuf.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/55187865323.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/41774293720.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/14065721212.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/18224069209.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/bupesidelut.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/33639784498.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/17750469816147cc425ca00.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/41377062345.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/30300882414.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/vawamubafisuvenabimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=5+letters+starting+with+dPDF 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_off0000bd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD41 10528 bytes
SHA-256: b814f0e990ab67003c308ad6973f9811fe82715b5517a90d5ca94d7e9827fbd8
font_01_sfnt_off0000d4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FB 17920 bytes
SHA-256: 4d4a43230ac793e4d8e76762df9effc09f3ba4e7117ba9010c0b7138b62433c3
font_02_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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