Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8cf5d3645adc87…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 21:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53448ef92eb55f3441988f16dab50dcf SHA-1: c27b229c1f160759c73b66f157462415a970e0ab SHA-256: da8cf5d3645adc870cbeeac37a12571c40a09246ecf277f47e3c7da2e2a37b99
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command-line-like sequences within the document text, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://krisoc.ru/uplcv?utm_term=2+states+full+movie+with+english+subtitles PDF link annotation
    • https://yennenga.org/business_school/uploads/file/234640428.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb937d6c3---sowabuwiwubevugaravazi.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/jikebujipoko.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/83516233737.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/60508049862.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8aa18683b---wifipaxulogu.pdfIn macro / runtime command snippet
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/17868441295.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/74174379203.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/75424487246.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/90890451416.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/nerowavoti.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/bepejab.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/1774412796.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/panesidumo.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210915_D248FD66A49041AB.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/gefuxapupo.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/89396054160.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/55326838645.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210915210424.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/89912684573.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/36536263963.pdfIn PDF document text
    • https://5udua.com/contents/files/51483226045.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/88009257960.pdfIn PDF document text
    • https://visualarchive.bg/files/refuliw.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/vudawirusujajadidawawava.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/83889257739.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/75623886462.pdfIn PDF document text
    • http://rogersdesignhousIn macro / runtime command snippet
    • 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_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 17612 bytes
SHA-256: ce946b7f62782021fc94a9054279c6864a2df86e7ae3f9d1670113ba2431bf53
font_01_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 10976 bytes
SHA-256: 22ac3ecc7944caac8811214609b7db451f510b90ebde971440f327ffa2a0e12f

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