Malicious PDF — malware analysis report

Static analysis result for SHA-256 645e4495e93d3fb3…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 17:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b33ec71831356c7bb048dc72f3d5f92 SHA-1: d3e0be8c437ab311d21b2c8ffe6e5cee5b0cd9ae SHA-256: 645e4495e93d3fb3b327cd84cc8e1e7e1519d44e9a890b34fa48dc59fed77422
146 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to a raw IP address, and is described as a link farm on disposable hosting. The presence of these links suggests the primary goal is to redirect the user to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=power+unlimited+2+full+movie+download
    • https://fotojursa.cz/userfiles/file/gurudisokamiwak.pdf
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/wuxaza.pdf
    • http://tandartsindex.nl/images/uploads/wavipumatixomi.pdf
    • https://npkfertilizerproduction.com/d/files/gufamin.pdf
    • http://ahlhy.com/uploads/file/060006107490.pdf
    • http://stalmont.eu/userfiles/file/41973158870.pdf
    • http://huijingweb.com/upload_fck/file/2021-9-10/20210910180839203908.pdf
    • https://verredistri.fr/xmedia/file/10943119331.pdf
    • https://bhiringisamsankalimandir.org/userfiles/file/dorog.pdf
    • http://chonburi33.com/userfiles/file/96769681871.pdf
    • https://tavio.ru/files/file/37651899179.pdf
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/zozisiparamagovofoxomud.pdf
    • http://dichvuhangngay.vn/uploads/image/files/tezemukefakemogusoboz.pdf
    • http://baltyk.recykling-rejs.pl/imgturysta/files/rovilowiwodujupulame.pdf
    • http://abwingsjanaf.com/uploads/files/92418165564.pdf
    • http://btfa.tw/upload/files/soxolugerozaxepe.pdf
    • https://nk-sostanj.si/files/file/tusatebikuzinifetesupope.pdf
    • http://bpabv.nl/uploadfiles/file/3718590278.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/xokivusibikopesipegule.pdf
    • http://magiepourenfants.com/images/mediamanager/file/59413332520.pdf
    • https://rougezenekar.hu/files/file/13042915095.pdf
    • http://orderkai.com/uploads/files/71927375518.pdf
    • http://immodraft.de/images/architekten_agentur_images_/file/19412841735.pdf
    • https://espiber.cl/images/uploadedimages/file/papusujoranajosaxomez.pdf
    • 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_off0000c2fe.bin
61f281589e609a6deffa79b5b6c2d5a4635daa4be0499b96095ed2d13c5a2837		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 16980 bytes
font_01_sfnt_off0000ef2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 16792 bytes
font_02_sfnt_off00010741.bin
76032ac41c83614f4d7e9331055485d794c712d40b84a2fbb07a6fa9c598a29e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 10720 bytes

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