Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b60acbbeb55cde…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 15:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a413f26626720a49da161e7a6ff5655d SHA-1: fd907498a83d0721739bbcc8b14616d2fd7bbcda SHA-256: a0b60acbbeb55cde5194648eabec51a43bc618a3c55d473d864b7bab8b2015c2
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 pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to obscure the true malicious destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=the+expanse+book+5+pdf
    • http://xtra360.net/campannas/file/baxesijezipewokogepod.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7d69651bcd944d3a1472ef859fa39094/jufeboxukugadaz.pdf
    • http://www.immo-uno.com/ckfinder/userfiles/files/6947303576.pdf
    • http://izeninfo.net/admin/upload/files/41838705909.pdf
    • http://naturpix.ch/cmsimages/file/sefokukexogu.pdf
    • http://infinity-c-t.com/userfiles/file/sowog.pdf
    • http://geopraxis.it/userfiles/files/pawelaxewomezare.pdf
    • http://cappellastudio.it/userfiles/files/79824926248.pdf
    • http://pphu-joanna.pl/fckpliki/file/gotefopemofaroxepukobapad.pdf
    • https://showdetango.com/bafa/userfiles/file/zulaj.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161459a4e687c6---detekefewizifiwofogat.pdf
    • https://rafautama.com/uploads/file/65227619684.pdf
    • http://sfipl.in/userfiles/file/xigevu.pdf
    • http://www.jindatunnel.com/up_files/file/golikisuzam.pdf
    • http://geoass.eu/userfiles/files/todimofazo.pdf
    • https://resttour.com/images/userfiles/files/98462157288.pdf
    • https://widerbet.pl/userfiles/file/kudofawavugitibegipa.pdf
    • https://escaletravel.com/userfiles/files/12038323864.pdf
    • https://amt-alarmy.pl/userfiles/file/69603934120.pdf
    • http://streetnn.ru/data/upload/ck/files/nidivigamapisosex.pdf
    • http://dkind.net/userData/board/file/16297119659.pdf
    • https://yellowstonewildlife.com/vuraba.pdf
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/bijupadibarolexutibuva.pdf
    • https://fablab808.com/nbloom/fckuploads/file/66544290645.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/98871343695.pdf
    • http://timebymtm.com/upload/files/juvozawis.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_off0000dfda.bin
482b33c3d2c4fc2413bcf8cb23329c532a745d7f5853a29e126ea371aaf2c841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 16864 bytes
font_01_sfnt_off00010b2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 16792 bytes
font_02_sfnt_off00012343.bin
4ea192ecef5f7e028de550b732bd9e8347c9392afee7b98ee0c4bb066148d50a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 10692 bytes

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