Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d61548d9667557…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 14:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1673ce0f1ea2b0a330f29d171a50b1ef SHA-1: c1dc5aa42f88d3ee264d2816c3b574ec3d216706 SHA-256: 67d61548d96675571cd9e087b1553dbeeb601435bcbdfde6cf4bba30e80354cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm. The document body is heavily obfuscated and contains no readable text, suggesting it is designed to host malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://cructi.ru/uplcv?utm_term=chat+sites+like+omegle+for+iphone PDF link annotation
    • http://leylasuren.com/images/userfiles/imagefile/sujilubup.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/42562718538.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/dilojejivejiluse.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/dugorosuzorowima.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/sukowewerusexozu.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/40065706991.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/gagoxoxuxajanogi.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/wurefifeb.pdfIn PDF document text
    • http://fitviewer.com/files/file/5010733676.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/zobudifirowu.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/gosupazijili.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/88431965252.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/nimufumatobavelob.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/83349641581.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/48888697313.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/digukoxipubururorogedigo.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/47803792416.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161494adaa87f6---4346480050.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/ganatigageselowelabali.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/losazujajegenewifis.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161380a1c95857---pivodimotupejibikudul.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/804215166.pdfIn PDF document text
    • http://dgjst.com/upfile/file/92989199351.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_off0000ae1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1B 10928 bytes
SHA-256: 582682c8170085375a13a7b96b7f140bb384f802b7cd3b41e164d4e152ff4f51
font_01_sfnt_off0000c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 14612 bytes
SHA-256: 8195158722f16d6c9bf4c14d0f8f7d8c921e8c70ce30fb3384162b3b521ffdc5

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