Malicious PDF — malware analysis report

Static analysis result for SHA-256 7311a7c067eb46be…

MALICIOUS

PDF

76.6 KB Created: 2021-03-23 04:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f81b9d1ac8cb0aa626c5d3ff1213d200 SHA-1: 512abecd3424c95ddd26bcc36346c584dca05505 SHA-256: 7311a7c067eb46bed8e4fd3f5663e450fc4b5adbae9238f484bfff11537c0ee4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware download sites. The presence of external URIs and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/wix?keyword=mod+camera+primeira+pessoa+gta+sa
    • http://stavki-na-sport.site/temopalonafelage2sqz.pdf
    • http://pusapev.scienceontheweb.net/what_is_the_meaning_of_tree_of_life_movie.pdf
    • http://natnat.fun/92961356493g8ic1.pdf
    • http://sarawavenudiwap.mygamesonline.org/unix_shell_script_cheat_sheet.pdf
    • http://sexesex.site/wipotifoniru9n8hv.pdf
    • http://shortsomfj.space/how_to_detect_motherboard_issuesnr6i6.pdf
    • http://prosucre.pro/95594794822r3gzm.pdf
    • http://vebuwovivulab.mygamesonline.org/robuzesubobolopizilovaw.pdf
    • http://itverys.space/how_to_use_a_campbell_hausfeld_air_compressorv322x.pdf
    • http://winnerslm.space/febalekibe6xt.pdf
    • http://naturapple.space/vavaxumedivk3xj6.pdf
    • http://rumigiwataj.getenjoyment.net/42712342474.pdf
    • http://neyroskakalka.site/488586030162jk37.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d1d0739-3a89-4a7e-aaf3-400e35670d32/medical_assistant_study_guide_2020.pdf
    • http://vekimawo.rf.gd/pulezuw.pdf
    • https://uploads.strikinglycdn.com/files/5bca48ac-2de3-4cc6-babd-29a0a505ede9/dasuniditodota.pdf
    • http://pizisufomabal.rf.gd/camminare_correre_volare_gratis.pdf
    • http://vaxabusegaw.epizy.com/pedugomimatikezusasowam.pdf
    • http://bumurulepowele.myartsonline.com/31505697745.pdf
    • http://sukujarodapix.rf.gd/37273131082.pdf
    • http://paritoxo.rf.gd/772848770.pdf
    • https://uploads.strikinglycdn.com/files/b6d5b96d-42af-4ede-afc5-2b231a30d1a6/how_much_oil_does_a_troy_bilt_generator_take.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e912.bin
444807eb6c593b84989e13b11885aa24f9d75e30be0af753024e6e924b7e7de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 5368 bytes
font_01_sfnt_off0000fb44.bin
069a8d029c95f18e38c21dcaf551114af982e9fbf88fc1453e1e09912847a7d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 13324 bytes

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