Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4abf85c56db2d0e…

MALICIOUS

PDF

70.3 KB Created: 2021-02-22 02:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 67ffd2f0790583f204e2a600afa2f14b SHA-1: 7d009aa72e0089e1af7ba5f35b8e512bff8e74c5 SHA-256: b4abf85c56db2d0e50985868910aee830f0fd30d25f9198b422be3eb1743dd7c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely attempting to trick users into visiting compromised or malicious web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=archery+merit+badge+requirements+2019 PDF link annotation
    • http://hotsales-com.xyz/what_is_the_oldest_biblical_text_ever_foundkp08f.pdfIn PDF document text
    • https://suxekupawuva.weebly.com/uploads/1/3/2/7/132710704/da53853e.pdfIn PDF document text
    • http://i-men.ru/nc_dmv_can_i_renew_my_license_onlineskw5u.pdfIn PDF document text
    • https://kebusivurokolu.weebly.com/uploads/1/3/5/3/135317059/kovogupaxileve-tonapawotixu.pdfIn PDF document text
    • http://eslivdrug.space/lopavokuriminiminakerukip8ocfw.pdfIn PDF document text
    • http://nakrutkavk.site/verasepusiravawukimikiudzq7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gituloropo.rf.gd/adobe_flash_player_android_7._0.pdfIn PDF document text
    • http://raziwisubuza.rf.gd/xovetizoxozudaf.pdfIn PDF document text
    • http://mejojaka.epizy.com/rajakaali_amman_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/sifuratiwizopeva.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/bhairava_movie_full_theme_ringtone.pdfIn PDF document text
    • http://semevalidenod.rf.gd/blank_map_of_the_world_in_1914.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_off0000d2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B0 6160 bytes
SHA-256: 2d58cfdf8b5fbce64f3960ebc0b9c7fb380efe15a42005e873b084750dcfe784
font_01_sfnt_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 10320 bytes
SHA-256: 30e961198575f254c4dfa5462891ea2d9f8765da51bc88aae49cf9c5e90e9811

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