Malicious PDF — malware analysis report

Static analysis result for SHA-256 f279ff2b77689ba9…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 16:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b7529dbf76d3f661c31ec2480169476 SHA-1: 03dfe72d44e1974f621f613818a3c799ed53557c SHA-256: f279ff2b77689ba9b9b19b039372b0efe69d6f8f3f9f89ead04a011a2b42e4c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or are structured as link farms, indicating a probable attempt to redirect users to malicious sites. The presence of external URIs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=free+iptv+2020+apk PDF link annotation
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/ferofozugijotevufej.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090723084773499.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/vinaritur.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/79285953136.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/35799283856.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210905_230006.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/90633594453.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/15275209809.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631562008.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/metivu.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/waruviv.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/bepenirofotobekebojaz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161368983daf65---kegikuratus.pdfIn PDF document text
    • https://bselink.com/userfiles/file/banusetegajuk.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/divesegazupef.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/pikenekobapekif.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ijdg8m1d6hhje2k05dlakjqba4/zabojelidi.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/62214000951.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/vukugefon.pdfIn PDF document text
    • https://diphong.com/uploads/4695676322.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/bomajitiputagazirodo.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/33013774307.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/rotijonesilijakuvafivoz.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_off0000b5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 10184 bytes
SHA-256: 75ddfc1aaed00375f48f78c4634489d2bbd72cdd7f3281315451fa2d5f9f0665
font_02_sfnt_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 19140 bytes
SHA-256: 4f831434e7d4a12e1fa3ad516ae5aafcf0907f913558fce61c4b91cdb2656e62

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