Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aba0aa64f501a7c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 21:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71ecbc6d567e372573fdcb5724e1a02d SHA-1: 47cea8acdfe434450785279eaf782f936a5f63b3 SHA-256: 3aba0aa64f501a7c81d18e3c2f7abe528c2ca1d3805188f2aae7641a73582b4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to obscure the true destination or distribute multiple malicious links. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rtquery.reitoken.org/Coaching123/images/files/medopawamolizawumimuxa.pdf In PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/gavokofuzu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161313f1b4e186---morevodirubus.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/10714416498.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xuparidulotefotevupivazef.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/zenixeniviban.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae339978e---75966479910.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kulepixuzutataki.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/8207003532.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/13192508325.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/lugogajalinodapivegu.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/fojawoxajibumirugufefagu.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/pemijer.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/63289212412.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/72913600075.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210906/files/20210906082412.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/nifububajorogebatazo.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/95126187943.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/jevij.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/fonovujijuwifoxovimujiji.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/33191646344.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/41406716263.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/60719765190.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_7CAF4B8B16E0192F.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=50+shades+of+grey+freed+onlinePDF 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_off0000ce04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 10808 bytes
SHA-256: 118c3bd4cc05af1172cd99997fb5f911b7e276080b89767bbe804864c4c02844
font_01_sfnt_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 18212 bytes
SHA-256: 9ed06606ecabb11eb1d67989544d7731c51ad260f0f1b2046e8f1f0b78aceb0c