Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8bab0056f2e598…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 18:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 584f1888f07d21e8360d65c8c9413277 SHA-1: 7974f18dc49719e5fba261c325f01a5fb7d92a8e SHA-256: 4e8bab0056f2e5987b2f52abb42bb6709e8018ccef915d56595cf5be594c3051
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. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=gta+4+mod+apk+download+for+pc PDF link annotation
    • https://tourpon.kr/FileData/ckfinder/files/20210922_03B650C01B4B1668.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/23191814420.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/45229763393.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/39049835620.pdfIn PDF document text
    • http://attlas.center/userfiles/file/44488641158.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5732c0182---lunokugisawemu.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/kefemiturutomeso.pdfIn PDF document text
    • http://gapp.fr/medias/files/35868702636.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630761013.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/99399048238.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/xobitidotufopadovoko.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/dakowabome.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/93785961377.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/30587278459.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/70613882034.pdfIn PDF document text
    • https://webmenuplus.com/images/file/33616625902.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/60947674895.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/57236763977.pdfIn PDF document text
    • http://hevolta.com/upload/file/gugafukubuxin.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/69752549530.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/21360541489.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/67460945035.pdfIn PDF document text
    • http://full814.com/upload/files/ronamesaxu.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_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 10684 bytes
SHA-256: ebf05c88a56c1b01af1a533ed3d77a9ee8ac70782a1369809411cb1eebc24e81
font_01_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 17748 bytes
SHA-256: bac25531eba064642c925fa2711495c097aad035f390b00406aecaa587f34635
font_02_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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