Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b0e83a10ea048e…

MALICIOUS

PDF

72.7 KB Created: 2021-03-31 07:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67fb1c0599498825882309996b204800 SHA-1: a678b202a0cc0c365c211334ed3aa9f8b6a2bec7 SHA-256: 65b0e83a10ea048e3263e68f93918373787cb0734c25958361855fc7fa098627
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links pointing to various domains, many of which are disposable or associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to a network of SEO-optimized PDF files, likely as a lure for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://gimoguvi.ru/123?utm_term=information+report+structure+year+1
    • http://italia-doc.fun/log_table_chemistry_downloadr1jzj.pdf
    • http://7gusevshop.website/manual_calefactor_emege_tiro_balanceado_3500xx8ph.pdf
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/4926068.pdf
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/wasakez-kagotebupidok.pdf
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/e823b247892f44.pdf
    • https://bumozirejukije.weebly.com/uploads/1/3/5/3/135340746/753152.pdf
    • http://online-sistem.site/76511225760l151g.pdf
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/wivuvebovitozaw_pifamile_datezuti_najevipoxe.pdf
    • http://yandex-dostav.ru/polaris_scrambler_500_service_manual_free_download968ed.pdf
    • http://hesap-al-sat.com/62194032382uls4z.pdf
    • http://game-pro.xyz/literacy_and_numeracy_skills_test_sample_questionse1idr.pdf
    • http://fortysgjdk.fun/fairytale_of_new_york_drum_sheet_musicoyb13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tovajukoxeboder.epizy.com/number_0_worksheets_for_pre_k.pdf
    • https://s3.amazonaws.com/sizadagazagaj/tuzator.pdf
    • http://wepexivir.epizy.com/22362983395.pdf
    • http://muxokekadakux.epizy.com/brgschaftserklrung_kredit.pdf
    • https://s3.amazonaws.com/gixirojozogufux/xivubupinimadokej.pdf
    • http://lavavoju.rf.gd/entrepreneurship_book_for_senior_high_school.pdf
    • https://s3.amazonaws.com/jeworurowam/pefurabidob.pdf
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_c893c1f13c09426aa5c2d6973b054381.pdf?index=true
    • https://52b03d57-94e3-497b-b2ee-5a576b8f136c.filesusr.com/ugd/67ae49_96ecab75585c4a1891cf11900d5e40aa.pdf?index=true
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_18c1507ac4754b459da7a3da9160c063.pdf?index=true
    • 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_off0000d31b.bin
3a25a3d174593af42b50bf3d99703c7c69aad07872fda5d7430ceb23787ae540		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 5104 bytes
font_01_sfnt_off0000e465.bin
11b10e0f06b1133e46c2990b42a66ecb7148401eba503262717116661c641ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 10308 bytes
font_02_sfnt_off00010740.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 4324 bytes

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