Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49de5f0cf600490…

MALICIOUS

PDF

83.8 KB Created: 2021-03-28 16:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4465f79415c1a20e0e3ac859c5e0dea SHA-1: 2319802895da687b97515b0278f79955b5542e4f SHA-256: e49de5f0cf6004901b9a9c95b2606ab491ecce246c030f5d00178b4fc8cea3d3
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are disguised as relevant content, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/wix?keyword=booking+revolution+mod+apk+2019
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/nazer.pdf
    • https://bipasakugerada.weebly.com/uploads/1/3/4/3/134350286/a6547604faa446.pdf
    • https://sibafuguwo.weebly.com/uploads/1/3/4/6/134679660/naruwik.pdf
    • https://rikovikoxeko.weebly.com/uploads/1/3/2/7/132740842/wivek-vidiwivuwu-nojilarinuwejo-nifofivas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_3cc83a06094242c4996f862b69abfccf.pdf?index=true
    • https://s3.amazonaws.com/bamepofewalada/troubleshooting_roper_washing_machine.pdf
    • https://uploads.strikinglycdn.com/files/433a6a48-d5ea-4ccf-b7b2-ce9706a6cd85/wifomujipobezawijewene.pdf
    • http://dibunon.epizy.com/simple_loan_agreement_form.pdf
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_d0f3b78f64024172bf09ffe76e2db246.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_e1750e79b4da4d64a67ccb42bb4efa9b.pdf?index=true
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_90a39051dddd4c68aaa01a38be1f8afe.pdf?index=true
    • https://s3.amazonaws.com/fojaxexino/bauer_bodoni_roman_font.pdf
    • https://s3.amazonaws.com/davubewu/40725534694.pdf
    • https://uploads.strikinglycdn.com/files/37bf614c-e2a2-4fdd-b679-15fcd9bb96c0/napovevulamigod.pdf
    • http://retesatitogeli.epizy.com/antivirus_software_for_android_mobile.pdf
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_08ffcf5217414a43bd92f51337b05a68.pdf?index=true
    • https://uploads.strikinglycdn.com/files/922c427a-4afc-4edf-b3fc-8cd63f567645/which_is_better_transformational_or_transactional_leadership.pdf
    • https://s3.amazonaws.com/tigovatolis/mirae_asset_mutual_fund_sip_nach_form.pdf
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_4b02e392caa647c7af4e0e9b73940f5f.pdf?index=true
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_2c006902402d4d7aa0822cfe55b19642.pdf?index=true
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_95260c6e1c4c4f2497f66481534ed566.pdf?index=true
    • https://s3.amazonaws.com/bifamomove/best_keynote_templates_2018_free.pdf
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_3c12ff86f86c488f9c2d34cfca2049d1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/780a3479-409c-4b92-b3cc-d2b1fae12bb8/does_trojan_fire_and_ice_make_you_last_longer.pdf
    • http://gusizozubamu.epizy.com/zimapubelukitovuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd71.bin
65ec7ebb2b8ecd735bf88cc29724aef5cd8607eb814fca6d7d2d71c0f03e6a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 5640 bytes
font_01_sfnt_off00011096.bin
01935899cc0599e7b484e3e64002c86e70b07469122db5d7ded3c60a0e9cea93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 10212 bytes
font_02_sfnt_off000133a3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 4324 bytes

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