Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a1c90e27d8ba51…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 20:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37b797b44d64ed627169882aca2557c8 SHA-1: 49aa2c28d25efb84b521fcc467c2904cff6eba27 SHA-256: 43a1c90e27d8ba519bb31918c0e525401145935e9c15f2488386896d196c9f14
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=average+velocity+time+graph PDF link annotation
    • http://snuhonors.com/userfiles/file/15900965109.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/leripoxanul.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/55383362479.pdfIn PDF document text
    • http://mosjob.ru/images/file/mezeposigikedetedewum.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/lobizamokezusonifagos.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/tizotegakipido.pdfIn PDF document text
    • http://kasand.com/userfiles/relebaworuworusis.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/raxofu.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/48717383204.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/13649215752.pdfIn PDF document text
    • http://keramann.ru/uploads/files/raxeruxiluretakewule.pdfIn PDF document text
    • http://gibisch.biz/files/files/83224134624.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/53351707.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/35767742068.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f249b81f---dipefifawitenadiri.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/66574024911.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/31404903320.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/dowazalirakarajarafew.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/zigogosafasudapiteg.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/55764149612.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/48478215480.pdfIn PDF document text
    • http://acelybio.com/upload/files/naxivudemenibesoligaxe.pdfIn PDF document text
    • https://tomas-music.com/contents/files/89391075334.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/2598195064.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 18304 bytes
SHA-256: 109cf06c0842228c5a81f337e877e2e089645ea1c88c6380430426b6e91ea963
font_02_sfnt_off00012238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 10708 bytes
SHA-256: d8485f4b4b84845694b91090a968c854f077e07699b524697c1f09d057239126

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