Malicious PDF — malware analysis report

Static analysis result for SHA-256 95182dfdfaeb5ca9…

MALICIOUS

PDF

67.8 KB Created: 2021-09-26 11:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cd826777a8d3c75782bbd2e4844fd5d SHA-1: a14fb4dc6546cb00626bf6c67ca514e421da6124 SHA-256: 95182dfdfaeb5ca9c1e72825ff13050d09de6db057df5f7836906b5a538cf357
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an image-only lure, a common tactic for phishing or malware delivery. It embeds multiple external URIs, including one pointing to 'nomylo.ru', suggesting a redirection to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a trojan downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=live+streaming+app+mod+apk
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2afil5hf3lgp46307u04fhkp13/31584705426.pdf
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/96563544500.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jeluf.pdf
    • http://maremania.net/img_pagine/file/21225107891.pdf
    • http://ural-resyrs.ru/data/file/dikuxisitenizoxevexi.pdf
    • http://3sdent.com/upload/files/wajarugijexipugej.pdf
    • http://poexali.org/static/image/_u/system/files/mejofuvowekul.pdf
    • https://nusamulticentralestari.com/Uploads/userfiles/files/misawulojop.pdf
    • http://lasfyy.com/uploadfile/file/20210904170023565.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78533661568.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vofinivo.pdf
    • http://grandioso.asia/editor_upload_image/file/tideriwumepisekaz.pdf
    • http://sushibelovo.ru/files/lanod.pdf
    • http://neowork-rh.com/userfiles/file/83979287136.pdf
    • https://hongmao.tw/uploads/files/202109122103269243.pdf
    • http://sportservistocik.cz/UserFiles/File/gomijote.pdf
    • https://kettosallampolgarsag.net/imagini_ws/tinazunekenasobebesagawuw.pdf
    • https://ajambary.com/userfiles/file/daniwoxalusota.pdf
    • https://mpksieradz.pl/upload/file/79806541301.pdf
    • http://impex-italia.it/userfiles/files/16391718407.pdf
    • http://kayapalinakliyat.net/file/sodusasanesipepozij.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/jodisamojudarib.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_off0000acc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACC8 16792 bytes
font_01_sfnt_off0000c4df.bin
6085e9ea473c6df304be2a0428c2b398ff968a615ba3fcb8e1ce27caec83d0b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DF 10804 bytes
font_02_sfnt_off0000dd95.bin
0a1073a66c3c6cb242df331532c0fe8c47b198267980abb2acf5eaaea971328a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 14504 bytes

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