Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9bd2e6abbb90f9…

MALICIOUS

PDF

83.4 KB Created: 2021-03-18 22:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d3debedcae2fc304c40d87481d890b6 SHA-1: 34af6c5b9d146ed23a38d721fc15a70998e18f82 SHA-256: 7e9bd2e6abbb90f956e71652c7984ced11dc3456b18d99f0e55a68e609418e39
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on free or dynamic DNS services, indicating a link farm for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=marshmallow+toothpick+tower+worksheet
    • https://kopiwuzurori.weebly.com/uploads/1/3/1/3/131398237/d70182.pdf
    • http://nituzovido.getenjoyment.net/employment_contract_sample.pdf
    • http://xutarima.22web.org/isomere_alkane_strukturformel.pdf
    • http://tiwilib.iblogger.org/68798022915.pdf
    • https://lomekizawulom.weebly.com/uploads/1/3/4/7/134704223/c76ce4ee0d.pdf
    • http://dawexefif.getenjoyment.net/emperor_jones_records.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bubexixan.epizy.com/alien_isolation_graphics_mod.pdf
    • https://uploads.strikinglycdn.com/files/e7cdf694-8dc1-4fb8-908b-996df508631d/nilomesi.pdf
    • http://wevoxefi.epizy.com/24356115317.pdf
    • http://didajuna.rf.gd/problem_solving_examples_with_solutions.pdf
    • https://uploads.strikinglycdn.com/files/7d20426a-070b-40ac-ba36-2326a562dff5/45343999965.pdf
    • http://vivotes.rf.gd/molecular_and_cellular_biology_impact_factor_2005.pdf
    • http://rafoputoxuxu.epizy.com/wukodowixutapoxovuzim.pdf
    • http://dirazonun.myartsonline.com/gone_with_the_wind_pocket_book.pdf
    • https://uploads.strikinglycdn.com/files/baff48d0-aa7f-47d5-883e-cbd256335e92/clasificacion_de_los_bienes_derecho_romano.pdf
    • https://uploads.strikinglycdn.com/files/a1467e87-03bf-4ced-bfb1-045d42cc05df/67536853297.pdf
    • http://biborufa.epizy.com/disabled_toilet_design_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/60f53e90-af8b-4496-a1f1-e86e336a5ab2/is_final_fantasy_vii_remake_coming_to_pc.pdf
    • https://uploads.strikinglycdn.com/files/2c923b51-f4d9-4604-a3ce-bc9ebe6a80ca/hitchhikers_guide_to_the_galaxy_cast_2005.pdf
    • http://nufudojor.epizy.com/hungry_shark_world_hack_version_apk.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f6.bin
dfd3b34c71537db59688d4a38f9869f63bd1aad7a296f9680c50d5d81c94135e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 5336 bytes
font_01_sfnt_off0000fc04.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 1800 bytes
font_02_sfnt_off00010491.bin
eb6513d0708655a2613eeb89256789e1912fd1267556e49d9f185f564e46d2ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 10560 bytes
font_03_sfnt_off000128db.bin
bdb498a84294d2700f74802134fcccbe9562d64435b5e6d8d4f3fb931e33cb92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128DB 16144 bytes

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