Malicious PDF — malware analysis report

Static analysis result for SHA-256 e463730f4e44ba38…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 02:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5e8c7603751f0b53335f9c14968ee511 SHA-1: 86b90195c55ef6759c3989ccaf0f8fc145071549 SHA-256: e463730f4e44ba3887ac84a6bd51b17644fc9d887864b7a3f2eac4ff0f58c1ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one notable URL being 'https://smidgel.ru/uplcv?utm_term=clash+of+clans+apk+hack+2021', suggesting a lure related to game cheats. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://smidgel.ru/uplcv?utm_term=clash+of+clans+apk+hack+2021 PDF link annotation
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901171846121497.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davume.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/8424478917.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/noweku.pdfIn PDF document text
    • http://elitacasa.it/images/file/sufudipeginatikite.pdfIn PDF document text
    • http://signauction.net/userfiles/file/giporisinusiv.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/moxujuligenep.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210902051907598053rmv19.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/78462718069.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/mototavuwe.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///35345080779.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/13224025285.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/tobirefiturozawem.pdfIn PDF document text
    • http://djapm.com/userfiles/file/73925393057.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/58879406812.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/pawujile.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/fimejusuduwi.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/gimupuwafuxuxu.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/40622737160.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_off0000c3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BC 10572 bytes
SHA-256: db05c82c45319d230e4388eaf6caa14a173e0b7e712ec56c3ee6a8137c258562
font_01_sfnt_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 17548 bytes
SHA-256: 60d36381c25a85febcf0cb8aed11c4a183262161af4bf606628d1a1f2e2ff9dd
font_02_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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