Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f3312f2918d23c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 12:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7290eecc853022b60840b02d6e8c6d21 SHA-1: 7605a6b790ef929e56e7be965ff8fe21551ca353 SHA-256: d3f3312f2918d23c486e9a89a9d03a42c2e5d37e45306a30ee0f753d0c119614
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed as a link farm, pointing to numerous external URLs, some of which are hosted on questionable domains. This pattern is often used to manipulate search engine rankings or to distribute further malicious payloads.

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 http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7aa1a09e---40873529859.pdf
    • https://vcubusinesssolutions.com/userfiles/file/11923474303.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/16766612468.pdf
    • http://yingtailong.com/upload/file/2109060448547480602pz9ywtn348r.pdf
    • http://franchisefarm.franchiseharbor.com/files/files/98486837919.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/jibatuzupobujabavadezize.pdf
    • http://logtech.cz/foto/Image/file/5322192931.pdf
    • http://avanti.pl/userfiles/file/47093514141.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/2682509505.pdf
    • http://beverly.kopanramen.com/uploads/files/dakebopunapetozirisenami.pdf
    • https://ppntassone.it/dati/upload/file/44175380361.pdf
    • http://joyear.com/ckfinder/userfiles/files/lajaxuxabo.pdf
    • http://papierplus.pl/userfiles/file/43855379166.pdf
    • http://b40555.handyfriendship.com/upload/files/jexinamevideroxu.pdf
    • https://valeaflorilor.ro/img/uploads/file/dukepigesamabogejeg.pdf
    • https://zapret-rf.org/web/img/podborky/files/viwovobufazurixijuvexa.pdf
    • http://kovofilm.cz/userfiles/file/vemupimuxifimaxalogobeg.pdf
    • http://seksdagen.nl/userfiles/file/79879811642.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614032b323a6d---kifobexasotedoxunemus.pdf
    • http://studiomarazzi.eu/userfiles/files/keduravadajiveju.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/94180135613.pdf
    • http://safaraval.com/basefile/safaravalcom/files/jerejimibisuponalorepo.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/35022730657.pdf
    • https://hotelcorona.ro/files/62565918272.pdf
    • http://nature-revive.org/files/file/natejirusanemani.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/93013627985.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=brotherhood+of+steel+fallout+4+ranks
    • 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_off0000ed28.bin
c16dac462778bca908c1fddad1f21f61796f52dedb08288d65fbbfcc6fac9dfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 16548 bytes
font_01_sfnt_off00011801.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 16792 bytes
font_02_sfnt_off00013018.bin
53bb9fe1584fd2ce3a95899fe827e3b95b9cb58935bda01af044fc19189db5e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13018 10680 bytes

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