Malicious PDF — malware analysis report

Static analysis result for SHA-256 a978a94afd0fea6d…

MALICIOUS

PDF

69.3 KB Created: 2021-02-22 22:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 10cc8ed38b19f29ccce91c75bc62b9fb SHA-1: 9fdabf31e41899918f82c7e2e290749cef4fe72d SHA-256: a978a94afd0fea6d34ce5ab4e57331f3505078c48d3cb0d85f9cb2252e9600c3
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which are hosted on disposable domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=what+do+you+mean+by+ionization+enthalpy PDF link annotation
    • https://cdn.sqhk.co/xeviremal/jijjfhf/35222251155.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/vjhYjbL/10017764108.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/zhjidRx/63633646731.pdfIn PDF document text
    • http://dayzcommunity.info/chyba_e3_Samsung_prkaz9gva.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/journal_editorial_report_11_17_18.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/2gdhjwK/suganawejamu.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/rhhs7hf/intersection_controller_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/bWPzUjj/47947499910.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/0igagj3/chicken_shack_fast_food.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/dMjTgcf/51400500446.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/sM0hihj/fiximagatibavegifanor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zivuneko.epizy.com/55635015589.pdfIn PDF document text
    • http://sedoguzod.rf.gd/imperialism_vocabulary_answers.pdfIn PDF document text
    • http://dutugege.epizy.com/tinker_board_android_nougat.pdfIn PDF document text
    • http://bozumux.epizy.com/beatless_light_novel.pdfIn PDF document text
    • http://vezapuro.rf.gd/cute_formal_dresses_for_13_year_olds.pdfIn PDF document text
    • http://gaxodusipif.epizy.com/bukunmi_ife_okan_mi_song.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_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 5228 bytes
SHA-256: 5c9ff3a79d94208c6fa99fd5a795e0109baede954029811fad9a6e2d7b877c52
font_01_sfnt_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 10872 bytes
SHA-256: e285e4e2ee052ab5afa7eeb0a3f40efb90e6d0e3513b32a6a01d80e158dd5597

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