Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3577773c4cc8ab…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 03:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f472443c392f1221a880ff9708148aae SHA-1: add2f1c5a95206e15741b227d11215d06fa6a5de SHA-256: 1c3577773c4cc8ab70a3ba45f03576cfe8965933807b5196531ade31b9136fa8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as part of a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links, likely for phishing or malware distribution, rather than providing legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=wear+os+running+app
    • https://kurishupally.org/userfiles/file/42397655602.pdf
    • https://remont-bez-zabot.ru/files/file/41160773238.pdf
    • http://bumsnab.ru/uploads/files/34424465830.pdf
    • https://jhservice.net/imagenes/galeria/files/vaxaxitogazokebama.pdf
    • http://pooq-design.com/app/webroot/fckfiles/file/kolifu.pdf
    • https://cuatudongsaigon.net/uploads/files/watukenejosulilufajov.pdf
    • http://dotacjedlaoze.pl/userfiles/file/migaz.pdf
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/91090024166.pdf
    • https://concurs-euclid.ro/upload/fck/puvasixex.pdf
    • http://www.yemany.com/yemfiles/files/dofer.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/gaxexikisonisa.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_13_04_37_24_6422.pdf
    • https://mobisteelegypt.net/userfiles/file/21295493256.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614519dfc3235---funik.pdf
    • http://elitvorota.ru/f/file/29201288213.pdf
    • http://sooam.com/files/fckeditor/file/619940187613476316c1e3.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/wujamelalatudogusemon.pdf
    • http://unityproductions.com/upload/files/xolerusexarogixesaradazur.pdf
    • http://aytekinpolatel.com/image/files/93420086806.pdf
    • http://ropesadventure.com/d/files/gopibekanerelikovovure.pdf
    • http://lnshiyue.com/userfiles/file/20210913052433_1461476083.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/tuwolikajax.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210909_B512584548BEAF6A.pdf
    • http://youzedu.com/ckimages/files/20210918053747604602.pdf
    • http://handsonmontessoripk.com/userfiles/files/30254712759.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161424148640ab---midajulemo.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_off0000e47e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 16792 bytes
font_01_sfnt_off0000fc90.bin
55fce47d5478cddf66d6d2633a36e0f415b9617cd352eaf849f150cacaaf80e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 16996 bytes
font_02_sfnt_off000128a7.bin
a72ff8829ac3fa1eef87bde47ade2b1db016b694e177718b3a548f031e10a1db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 10376 bytes

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