Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27ad25be7bd80ac…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 11:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca3879ed37e377cdad6f0add559f079c SHA-1: a6b297d8ba0c0d8865cd37dff476aac36e429e3e SHA-256: b27ad25be7bd80acdfeb24ec19cce817cd0c0e2f920aaa8ec36365377948ff4c
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 external URIs and is structured as a link farm, indicating an intent to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=rom+my+oldboy PDF link annotation
    • https://samajsutra.com/userfiles/files/80203869995.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/26642878626.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed30bb108c---74826593961.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/tuvokamamumuxupovoruw.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/lowamapare.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/duduvixaxanejukiveburuwa.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/99932167641.pdfIn PDF document text
    • https://atavio.ru/files/file/72739474210.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/68aocgio5ljlvlsmqc2frhn8jn/52086054476.pdfIn PDF document text
    • https://ntc-container.com/upload/files/70729152087.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210917_325F48DE6433DDC9.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/85592011638.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/kifizamobanavelovaj.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/46673430231.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/85085541655.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/32229875405.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/96541993779.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/79724655660.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/48154346892.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/migisawisusepixobure.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/48808148902.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/29078659475.pdfIn PDF document text
    • http://placc.info/up_image/vitosomebexojevewewakinaj.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_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 9852 bytes
SHA-256: 5f50c40f1559b378fa94bd23cd3c060dfa3f6f98dfe02c8cfa26cff1e4019f98
font_02_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 18144 bytes
SHA-256: ec9efed541860dfce623f477432ae61226f1e961707dd8503f0da6f1681ad040

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