Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3c62519bf6601c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 17:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b25d5b022cf07d55f992b9b6e95bcfe SHA-1: 5fda38ae0e2b082dec3b7effaf46cab09afb889c SHA-256: 7a3c62519bf6601c7158efab2c578a89f169691d2933347c868a76d24285dae3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=pc+suite+android+tablet
    • http://studiomontironi.eu/userfiles/files/dazurogawasitalop.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/52654c1d585981257ae6499a8f0a8e3f/77606724468.pdf
    • http://euro520.net/userfiles/file/1631710325609554380.pdf
    • http://sunrui-ti.com/d/files/patememarid.pdf
    • https://ip-pharma.net/data/files/legifu.pdf
    • https://thebottombillion.org/business_school/uploads/file/83287538890.pdf
    • http://autoachtercamper.nl/userfiles/file/73998446948.pdf
    • http://cecev.com/stockages/files/54246575263.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/hsocp3i2ql89lm6u3agfscfns8/pofuruwuwivujuzokonowenib.pdf
    • http://vallovin.it/userfiles/files/gonizuwodatenugolo.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/gudananagudapu.pdf
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/miwureforibozit.pdf
    • https://marwaservicecenter.com/nbloom/fckuploads/file/kegejoluxod.pdf
    • https://editionsitaliques.com/userfiles/file/rifetisinofiwife.pdf
    • https://lorus.rs/files/69299005504.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/lelejidudusitobavemabala.pdf
    • http://bixenony.com/userfiles/files/jevokemu.pdf
    • http://tysons-cafe.com/uploads/files/68550901006.pdf
    • https://ph789.com/pinhsuan/files/file/tezadi.pdf
    • https://premium-house.uz/images/file/33999461088.pdf
    • http://kangmeideyiliao.com/uploadfile/file///2021090419030411.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_off0000e11f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 16792 bytes
font_01_sfnt_off0000f931.bin
426d39fa52efade693d04a128608a0235e70a76acdd7aeda53f6b91e92893e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 17956 bytes
font_02_sfnt_off0001277c.bin
36a8caa94348524ab69cdb02715d3198c88fd20d73cb7b0c6f2ab0496c655707		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 10604 bytes

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