Malicious PDF — malware analysis report

Static analysis result for SHA-256 260507dc272f77d0…

MALICIOUS

PDF

88.0 KB Created: 2021-04-13 15:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8341b0b467ff07685f5c0f0ed20eaa6 SHA-1: 78cde3615b96d89d512db2bd559be1fcbb15dc6c SHA-256: 260507dc272f77d04d6507e815e0c5d1d41fa1d084205447a8b8b0bf64425b8c
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting, with one prominent URL leading to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. No scripts were extracted, but the PDF structure itself is designed to redirect users to malicious or suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=mamiya+rb67+pro+s+vs+pentax+67
    • http://worabipupe.mypressonline.com/dumobekegudide.pdf
    • http://shtancircul.site/momimekukoqubp4.pdf
    • https://static.s123-cdn-static.com/uploads/4426957/normal_6006db9ab4b5e.pdf
    • http://myimperfectmomlife.com/my_first_1000_action_wordshfnp4.pdf
    • https://cdn-cms.f-static.net/uploads/4467325/normal_602c5ea3c2e7a.pdf
    • http://mimivudarevi.scienceontheweb.net/envision_math_grade_4_textbook.pdf
    • https://cdn-cms.f-static.net/uploads/4365638/normal_6065931b57ffc.pdf
    • https://cdn-cms.f-static.net/uploads/4393180/normal_602e379021919.pdf
    • http://wopizup.mypressonline.com/jisugarezafe.pdf
    • https://cdn-cms.f-static.net/uploads/4450511/normal_606c3eb726ffb.pdf
    • http://rollernefritmassage.xyz/385290389nkzph.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://milatosokalazer.epizy.com/the_case_for_a_creator_student_edition.pdf
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_f9cf967e039443cca9e4eac5106815af.pdf?index=true
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_b2c8ec6f44e141fab53752fa4cc8ee45.pdf?index=true
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_9586bb6a3bc84a33a23b51b09c2912e9.pdf?index=true
    • http://gisipusizen.rf.gd/best_way_to_count_backwards_by_7.pdf
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_ec5cd9426b7549b2b44133a81245055a.pdf?index=true
    • http://borogibapomad.epizy.com/canon_raw_codec_software.pdf
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_9592f92e659f401aac3b8dd1194d8919.pdf?index=true
    • http://zuxebalu.rf.gd/85865425887.pdf
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_944f014f691e4d8fb445a488e9de03fd.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_off0000f6db.bin
cee0afcde6e156fd316de0c2cf7dbdb954b5fcd240d9681e3176d05ce310fb66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 10160 bytes
font_01_sfnt_off0001188d.bin
cd3bc6b89d752796feba3e116604a96a1bd0a4c87d90524c21fc690602ce0b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 5540 bytes
font_02_sfnt_off00012b6b.bin
118ff885f8647c710204845574663b8e73b10521f46a130d29d1853a4c5b00db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 10912 bytes

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