Malicious PDF — malware analysis report

Static analysis result for SHA-256 843b724c95866d40…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 18:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c455af2dd2e2c8d75d42758000e386a SHA-1: 33f9c090f5cff3d2666d0e964439e60544a02249 SHA-256: 843b724c95866d4012608218e9bae584a6c779105122910911155a9469417bbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' directly supports the observed behavior of linking to numerous PDFs on potentially compromised or disposable sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fanta-life.com/userfiles/file/tibepefiwunuzenulovimi.pdf
    • http://vdavloeren.be/userfiles/files/liwapovidijinexi.pdf
    • http://rc-saty.cz/gais/image/file/dolevekexilekowegamaxa.pdf
    • http://voszveszprem.hu/_user/file/xejorosejutejopasezog.pdf
    • https://7mark3t2-7aya.com/contents/files/95570873555.pdf
    • https://tsolisp.com/files/file/xaxenajajudimoviro.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/pobewunalawejuzabamolikim.pdf
    • http://bongoes62.dk/userfiles/file/24864205848.pdf
    • https://eirai.org/editor/ckfinder/userfiles/files/75714692407.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/baru3ju2b78dcheclipnpn5oek/bopetuwebomifomimusaxib.pdf
    • http://galluccifaibano.com/userfiles/file/59716043254.pdf
    • https://samsunyapi.com/userfiles/files/95727043460.pdf
    • http://registermycompany.in/admin/userfiles/file/17517312838.pdf
    • http://www.tramag.pl/upload/file/konatewikolatuwavazexokev.pdf
    • http://old.smartplus.pl/ckfinder/userfiles/files/fetipamukojefosusaviri.pdf
    • http://phutunggiahungoto.com/uploads/files/98464743996.pdf
    • http://retrievers.su/ckfinder/userfiles/files/71299755122.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b80c3f83---16656120419.pdf
    • https://vicareyou.com/userfiles/file/70046332522.pdf
    • http://www.kevimotor-rock.hu/files/files/40303585368.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/fawanutoxisofetifiteno.pdf
    • https://llibreriaha.com/img/events/file/13576827475.pdf
    • http://thevisionkharj.com/userfiles/files/dufiremikazuwexel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=why+are+ads+coming+up+on+my+home+screen
    • 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_off0000c50f.bin
3db3746a76806dfdb6fcf6fe3c5675dd1a062c1236997494c7f0c4a66d3dd0f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC50F 16800 bytes
font_01_sfnt_off0000f08f.bin
da8faa4a8c25d1c92f5b8a447d45984bdbac68f4656dd97bfbb47766cdd7ae9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 11024 bytes
font_02_sfnt_off000109d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 16792 bytes

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