Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a7b1198038a3e4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 02:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3c8b42671a5e0f64e1b75098f38b609 SHA-1: 3018ce27abedc9008231621d27d4af149de5e2ad SHA-256: 73a7b1198038a3e44531eda962adde31d7bfc60c994a21ea261e77d0ba6eacba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV. It contains numerous embedded URLs pointing to potentially malicious or spam-related domains, indicating a phishing or link-farming attack pattern. The PDF structure and the presence of external URIs suggest it's designed to redirect users to these external sites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=chess+online+cool+maths+games PDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614086d767905---9345493018.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/xebixukudesusebigetulanu.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/wukikugitugetunamovopa.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/ruwilogit.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dorona.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/59973668751.pdfIn PDF document text
    • http://nawarashop.com/phya/ckfinder/userfiles/files/87371935061.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wejafisekisarire.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/sefemuwozujunalezonawalil.pdfIn PDF document text
    • http://csp.hu/editor_up/buziwemavudavamoxegopegax.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021915154815967.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/5458085644.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/tefolurerinexomiton.pdfIn PDF document text
    • http://innotack.com/userfiles/files/kolifojesixuninepazi.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/13873410167.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/visunatijawudevidabap.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/matixotudokigivigojog.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/51065395096.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/73846307725.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/gelabetepugerulisew.pdfIn PDF document text
    • http://asfalon.com/__files/file/80897104587.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_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 10608 bytes
SHA-256: cd4c25ca89d05c19ced8453ab254fe5b5fce5843b2762abc1feab116464e0baf
font_02_sfnt_off000115fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 17764 bytes
SHA-256: e8f11b6ca049afe815c194614bb6279dc148fc3b644b6adfbf29152796b277c1

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