Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ac078eff1cada5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-24 06:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dad54b0d11956d17d4ac246337333594 SHA-1: c0585f6f3ad608e64687ea76a8e423159636bd45 SHA-256: a4ac078eff1cada5c6bedda0389f76c9ddb25548f3ef4ce4389d8473b3e915b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various PDF files, suggesting a link farm or distribution mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags it as a link farm on disposable hosting, with a 'utm_term' redirector, indicating a potential SEO manipulation or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://veaodaibrahma.com/uploads/image/files/momivazunezajowide.pdf In PDF document text
    • https://kimcert.com/E/file/kuxolapilum.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/63287621113.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/rogijoresur.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/rukovalegudurekid.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/xagamusebe.pdfIn PDF document text
    • https://vitanov.rs/files/92836191323.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/3309149914.pdfIn PDF document text
    • http://keacg.com/upload/files/kurunoruk.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fead1bd431---ragexas.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/37915702750.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/25440735235.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5b44f9ac3b11f683e495c458423551f7/85953929737.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/welam.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/vosavuk.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/43591291439.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/zafuvupiwaliginoniru.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/32100880398.pdfIn PDF document text
    • http://anindecor.pl/files/file/deruraluvafukanu.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/rajitidiburamag.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/24568686018.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/88198243883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=oxford+handbook+apkPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/nitipe.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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 10420 bytes
SHA-256: a540b98c65db31133260eaa6a79f22fb97b6c2494691b161d64593609c081889
font_01_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 17296 bytes
SHA-256: fe6d51e6499cff48a14d0429d542ede45f1befbab1b14518e6f965e3951bf4c8

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