Malicious PDF — malware analysis report

Static analysis result for SHA-256 74aaa16d4bfc5e24…

MALICIOUS

PDF

68.4 KB Created: 2021-09-20 03:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 027b2e6ed457c3fb1767c14652f90688 SHA-1: 6e7a0b3cde326442f4fb092735a40f5ca088ccac SHA-256: 74aaa16d4bfc5e2413ffe76d4953de4e7fea8c98f32874cf6bac411b748c1b92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers 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 presence of external URIs and the 'disposable link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://myrbacken.se/login/ckfinder/userfiles/files/xozogokexoji.pdf In PDF document text
    • https://computerzone.pk/file/kinixewajuzomaros.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/xuxeribaxepipatorex.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/zuwuxugibula.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/mipon.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/88489213173.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/kujixewevufubujapi.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/17876361052.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/82765808377.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/fapigidazodol.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/wuxudufazisowinilut.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/robixojiranawakib.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16130a54e5b510---rujaxekisule.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/xubufafilosedis.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/jarejilamusuniwaro.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7660c0a9b9c9e9ac480a900bd19139b6/15836791564.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/ludosaxarikixuzarav.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/pinewurumewimowopasuv.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/difejejatadifajegugovi.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091516272754.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/masarugojenobizi.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/9834897404.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/35375081310.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/45561253755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+how+to+change+download+locationPDF link annotation
    • 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_off0000b036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 14364 bytes
SHA-256: 13419a81428a7e0a1fa2384e18850ba2be539edd426d21213c9f29064450921f
font_02_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 10548 bytes
SHA-256: 9638a9be776ef2a604f33171540aeb9d37e51e5c817be1c87ade66df8f34d290

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