Malicious PDF — malware analysis report

Static analysis result for SHA-256 374f2a7512822c4c…

MALICIOUS

PDF

76.0 KB Created: 2021-03-21 12:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d2ae181a9d3372607606c937fa6121 SHA-1: 746b8c3af3bf1453b1d6bdd5fc04b0dff4db2954 SHA-256: 374f2a7512822c4cb4276601569e79cb0101d49cdc76efcb0dc6d36cc6105dae
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The document body, though partially obfuscated, contains text related to 'likert scale analysis' and embeds numerous external URIs, many pointing to disposable domains, suggesting a phishing or link-farming lure. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=how+to+do+likert+scale+analysis
    • https://cdn-cms.f-static.net/uploads/4479933/normal_6056dce0209ef.pdf
    • http://xelasurugopu.mywebcommunity.org/how_to_clean_shark_professional_steam_mop.pdf
    • https://static.s123-cdn-static.com/uploads/4463272/normal_5fddd1939564d.pdf
    • http://tanubujurutemut.scienceontheweb.net/severity_and_priority_examples.pdf
    • https://static.s123-cdn-static.com/uploads/4449422/normal_5fcd19464181b.pdf
    • https://static.s123-cdn-static.com/uploads/4415526/normal_60052b1ec4d2f.pdf
    • https://cdn-cms.f-static.net/uploads/4479921/normal_6026a1d32764c.pdf
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5fec7a3587eac.pdf
    • http://punejew.mygamesonline.org/butovagege.pdf
    • https://cdn-cms.f-static.net/uploads/4424647/normal_6049c09451834.pdf
    • http://vataponuxizeliz.mywebcommunity.org/how_do_i_get_a_religious_exemption_for_vaccines_in_nc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/03e25b9c-db61-4702-a1c3-bbc0e0c05a6e/flash_canon_580ex_ii_price.pdf
    • https://uploads.strikinglycdn.com/files/8dc21c20-aa79-4a20-8e7f-8e960cd5ef1d/38282802520.pdf
    • http://fuvuvadut.onlinewebshop.net/caderno_de_caligrafia_japones.pdf
    • http://xinifaduzinuvu.onlinewebshop.net/muvidaponit.pdf
    • http://gavawekib.myartsonline.com/ielts_reading_answer_sheet_free_download.pdf
    • https://uploads.strikinglycdn.com/files/184ff2f2-9a03-431d-a0cf-6a4960073e96/how_to_tell_the_age_of_a_lennox_furnace.pdf
    • http://tavamikilav.myartsonline.com/rewusobiligidawusokez.pdf
    • http://lavisekenesavof.myartsonline.com/tidozawoses.pdf
    • http://gegilifopom.myartsonline.com/96857863812.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_off0000ec2c.bin
c30297607c4e8d71e578effb0a9dc7b8f5087026b2b753b2afb3fb27f8015411		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 5152 bytes
font_01_sfnt_off0000fdd7.bin
2298b69c5cb9c25fb39c5ce48bbdc7bec1dc6329df1bcfab20b6b1dad45aa8c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 10736 bytes

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