Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ec3432a9641686…

MALICIOUS

PDF

73.3 KB Created: 2021-09-15 23:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5deb6a5666693d9b26dd345af036352 SHA-1: 99f2c14142f02947a2f8da9538c19e7b615bde10 SHA-256: b6ec3432a9641686872c3bff02fc7f435f570b8d42390a31217aaeaa3f7ef6ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to execute further malicious actions or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tamtamphat.com/upload/files/datusaridubukovuninuz.pdf
    • http://sushimura1.com/uploads/files/88414486586.pdf
    • https://swiz.eu/files/editor/delevotokabuwufojoravuzo.pdf
    • http://oskarmak.com/userfiles/file/42536726017.pdf
    • http://soldearenales.com/galeria/files/rusagetofiwu.pdf
    • http://otworz-biuro-podrozy.pl/userfiles/file/wojasemefejibegow.pdf
    • http://iaestedresden.de/userfiles/file/meseji.pdf
    • http://linpus.com/app/webroot/userfiles/files/74719127387.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe0a1f6d6---defaxozeza.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/tiwif.pdf
    • https://vinocastillo.hu/editor_up/jurezaka.pdf
    • http://mikomisushiwc.com/uploads/files/likegewonukezutadifoxunig.pdf
    • http://pdww.ru/ckfinder/userfiles/files/32914542651.pdf
    • http://elosc.com/upFile/file///ITX202109101517327619.pdf
    • http://myphamnanyno.com/luutru/files/nezopifapepivezo.pdf
    • http://hwayinn.com/image/files/20210903_105506.pdf
    • https://www.hkha.org/ckfinder/userfiles/files/17681500152.pdf
    • https://gedayapi.com/userfiles/file/nubotetelofibozaman.pdf
    • https://academiapreprod.riportico.com/userfiles/files/47882589453.pdf
    • http://deforma.it/userfiles/files/pitigezomitivixup.pdf
    • http://morakothotel.com/file_media/file_image/file/taseraje.pdf
    • http://www.ondebiz.com/userfiles/file/tevidalidu.pdf
    • http://48bulls.com/js/upload/files/lupenededaba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mod+apk+empires+and+puzzles
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8fe.bin
eb29ace79e2b41b192d54dd34754c3fa07d54f09bcc9809fd3d5cc1c9ac7c897		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FE 17676 bytes
font_01_sfnt_off0000e6e9.bin
8044fe379ae89ec0523920a55ff38adf347f5796b6532850cc2f0ab06d5dfe56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 10700 bytes
font_02_sfnt_off0000ff68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 16792 bytes

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