Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d55f81c41311cf…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 18:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40b8ffa2491a9b349c7eda4c77451bf0 SHA-1: ca011382d8cf2a583d27cf8424a0ecfb97abc391 SHA-256: 74d55f81c41311cf3b4673ef7fb8c985e91c7b694818c8e4656f1ef60271010c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits multiple indicators of malicious activity, including external URI links and a high ML classifier score. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely attempts to trick the user into providing a password for an archive, a common tactic to bypass gateway scanning. While no scripts were explicitly extracted, the presence of numerous external URLs, including one pointing to a raw IP address, suggests the document is part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=como+desinstalar+o+google+fotos+do+android PDF link annotation
    • https://alpinashop.rudy-ra.com/files/5227596773.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/dazemamu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161328b1139706---33446228917.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c4c9c24f7ed387f7682dfb1055baa40a/mexoja.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/zanisasawonak.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/21042613697.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/sojaxifevafu.pdfIn PDF document text
    • http://lovesenergy.nl/file/88879262768.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/tuvatotidarugad.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/sekuwag.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210907225239.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/pomojerimepulate.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/sivuwavin.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/xixaxeguvel.pdfPDF link annotation
    • http://www.tamtrebinhminh.com/public/files/xiwuvizisuka.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/23664216734.pdfIn PDF document text
    • http://home-plast.ru/foto/files/konivawonegozuvedamadofot.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/raluzitezasobutag.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/98008422367.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/98631994381.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/kupetasab.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/lemomoremofifutipogus.pdfIn PDF document text
    • http://rongqichem.com/upload/files/35693183099.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/80199607433.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/29976610620.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 20720 bytes
SHA-256: f2d0e1d7989656f88970c20b72ed7e9f16a51f3dd0bc014da50bc31d5582ff78
font_02_sfnt_off00012f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 10728 bytes
SHA-256: fa637f1cd232637b6f47d26fdd914a2453f9c98bd316b642b950c3d29df908a5

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