Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c32db15b8899fd…

MALICIOUS

PDF

82.3 KB Created: 2021-03-24 23:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: dca75171aa9b3eb4e5262c53a41beb76 SHA-1: ebc0ebca468d209924a05e6baffbdbbb847ac3a5 SHA-256: 16c32db15b8899fdb2925c99d137eca0e2403ebcff2059ad086f71ddba9c51ba
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The embedded URL 'https://gimoguvi.ru/strik?utm_term=can+subliminal+affect+the+brain' suggests a potential phishing or content distribution vector, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=can+subliminal+affect+the+brain PDF link annotation
    • https://nukarefu.weebly.com/uploads/1/3/4/1/134131348/sabetuvugo_wukukap_pamakusol.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/hhfCOgj/mahalakshmi_smart_atta_maker.pdfIn PDF document text
    • http://dommasters.site/were_there_any_books_left_out_of_the_bibleftmdd.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/hicwWPK/zed_runes_s10_mobafire.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/d5fa08f98e1.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/ehajihK/67565868491.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/GuUdicr/qr_scanner_app_for_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/aUbJJvw/77352275376.pdfIn PDF document text
    • https://cdn.sqhk.co/lemusezilaz/gdq6heU/android_one_vs_android.pdfIn PDF document text
    • http://lyudi23.ru/108276062963oyds.pdfIn PDF document text
    • https://cdn.sqhk.co/savujegu/if83jcd/limeliwojeverovesoxoji.pdfIn PDF document text
    • http://voiprormul.xyz/984452388926kbp9.pdfIn PDF document text
    • http://austritkfa.com/free_editable_jigsaw_pieces_templateqpev7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jenusaselilavat.rf.gd/60214836979.pdfIn PDF document text
    • http://gilikasozomexo.epizy.com/72683294626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948d1fe8-7618-434c-bac6-6d9bb8a878ad/jarevewolelavod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73c51dd-0116-464e-b10c-07c8936a17f3/77519046130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5afd7b-a516-46c5-b785-a43e5934ffeb/what_is_the_next_sims_4_update.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 5168 bytes
SHA-256: 15399163fd7fd5ee156ecea3f70d0a1bcc9a5a6827191a56c02d5ff980518957
font_01_sfnt_off000115fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 11320 bytes
SHA-256: 0d7ce2eaedb5f3589009c09b222e5dfa7b5aedaafab6460e7912e1a8fd3d4b1f

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