Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d88642744f51a88…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 15:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78a1945f7aa46204a06764679c218923 SHA-1: b39c8a7417ed6633aedae5ae3ea6bdc0dd1beab2 SHA-256: 8d88642744f51a88fabd4c96a3b05ec1e96d8820233563bf737978b0efdf2589
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 of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The authoring application 'wkhtmltopdf' suggests it might be a generated document, possibly to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=ld+player+free+fire+key+mapping PDF link annotation
    • https://gabconstruction.com/ckfinder/userfiles/files/penofasekoxofijobiwojo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161353aea7a20c---tixolizetopugodutud.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/36230253251.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109071920442737.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/binosijifetinediv.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/tezatuzixaw.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/wuvodajanali.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/fitel.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff5c6a566---55456361953.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/30977096056.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/6692665311.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/mazeregidagavejupo.pdfIn PDF document text
    • https://elemonbg.com/Files/File/liwevakegu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/momejal.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/31592741553.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/zexinafu.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/42125730814.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/lewezumiratuforokojinali.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/94534612734.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/14532290456139ffb23c8a7.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/5335986349.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/zofasifoxewazana.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/sunavup.pdfIn PDF document text
    • 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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10620 bytes
SHA-256: 708d9a020d624afa115e55bf0af8c23d8c37f82e1a4b457cb2f51ccca4e967fa
font_02_sfnt_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 17960 bytes
SHA-256: ca272e062d1e985fe47c89a7e12bf74c5ce95907a7d215b2b695bd03db96b7da

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