Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c872f3cdc6fabfb…

MALICIOUS

PDF

87.4 KB Created: 2021-09-09 05:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8a174caceadc921a3fd99e7cdc3944e SHA-1: 3f81629360fdccaac3bd7b53efda4749184caa0f SHA-256: 6c872f3cdc6fabfb88964ef4ff7d64fd06d0f5f04f93ca1e380cec792ecdbef9
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 a large number of embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating an attempt to obscure the true destination of the links. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://malmospelmanslag.se/userfiles/file/42227218748.pdf In PDF document text
    • http://mcap.cz/images/uploadedimages/file/rekerisuminid.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/vogaviwuvi.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/sozuzasigajibozizodotexa.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/2643586634.pdfIn PDF document text
    • http://kp-bs.ru/upload/files/95396170176.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/15837345306.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/35541804129.pdfIn PDF document text
    • http://zzquansu.cn/d/files/tezuvinaxinerupovuz.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/67639062439.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ac23e63580dd1f80fdb46784ca50ea1b/30213106752.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/11565226400.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/94962247541.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/93716951948.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/felonoxuxamoxodis.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/kuxaluvowusiguzupaza.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/88160797260.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/56590139684.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/jegivizukakunux.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/63834298397.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/29734517357.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/8080668730.pdfIn PDF document text
    • http://watch62.ru/files/files/43264406113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=spooks+cast+listPDF link annotation
    • 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_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 19092 bytes
SHA-256: 0e6b8fb7591029ffa908d682945c1d47c4cc980e171ba89b88d2f8f2f2c69d80
font_01_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001394c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394C 10200 bytes
SHA-256: 5016669127259ed5fbb34e324da884af48b7f85663cbb9550b79f7e92a1ecd3c

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