Malicious PDF — malware analysis report

Static analysis result for SHA-256 de44919caf5bd3c6…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 14:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a407df7844ffd8b5134b834bda010ef SHA-1: 45630590724bae61343774c2f6df73368e989c8c SHA-256: de44919caf5bd3c62dcaf8dda221ffb691a7437b62a3de81a9cbe07db3acf794
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, many of which point to other PDF files hosted on various domains, suggesting a link farm or distribution network. The document body is heavily obfuscated, but the presence of external URIs and the overall structure indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://m-camper.ru/ckfinder/userfiles/files/larenaxutibobizub.pdf
    • http://jrpst.pl/userfiles/file/monewimegarulazuk.pdf
    • https://oazapiekna.com/zdjecia/fck/file/79890127295.pdf
    • https://osikovo.eu/webroot/img/content/files/25477924106.pdf
    • http://rracc.com/file_media/file_image/file/92012233148.pdf
    • https://nordiskvillaventilation.dk/userfiles/file/6624892608.pdf
    • http://strategie-online.net/catalogue_dynamique/file/kofoda.pdf
    • http://parfumland.sk/upl/mirazedos.pdf
    • http://evola.it/userfiles/files/zedudebabunin.pdf
    • http://omatsuri.kr/data/userfiles/files/53069781078.pdf
    • http://zgkimsteszew.pl/img/upload/files/16282553191.pdf
    • http://hydrem.ru/images/file/40154048034.pdf
    • https://yingzhaoliuart.com/upload/file/sevigoris.pdf
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/tojanidef.pdf
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/kalusurolituzevowe.pdf
    • https://kentacademymiango.com/userfiles/file/99521552722.pdf
    • http://forepic.com/_UploadFile/Images/file/tubejepiwo.pdf
    • http://geopraxis.it/userfiles/files/fosililatowuzalaxobofoka.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/morabidi.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a32585dd7e23ba2926be5879e94e5a6b/69943484399.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/osjn57rrm1g0h8jqnpr086dd2b/ditofexet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+garry%27s+mod+for+free+on+pc
    • 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_off0000c70f.bin
656d169b8429b4e08b033098ca62334a33e9978f62a38ea6e0bee9af842587ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC70F 17004 bytes
font_01_sfnt_off0000f2ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 16792 bytes
font_02_sfnt_off00010b04.bin
754c2edd3df241ae1fabe12dce68e20bc01057632770505c4bbdaeeed9c4ee29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 11048 bytes

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