Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a685635e2b23cf2…

MALICIOUS

PDF

75.8 KB Created: 2021-03-16 21:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b473d94bb1889e2dec027e0992bb2937 SHA-1: 75251ac6c548fd081d89931490735fc0d4e826ab SHA-256: 3a685635e2b23cf2edb57b7ee79c9ea5a67c0629971a22ef6c7f02e660896081
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=clues+from+the+karyotype+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/sururezog/g3BRUif/tchadcarriere_pam_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/g3igiaE/73289488076.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/2258720.pdfIn PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/6234431.pdfIn PDF document text
    • http://izzzaaa.space/366531721107pin9.pdfIn PDF document text
    • http://gooddevice-online.com/78342559073akh1n.pdfIn PDF document text
    • http://mx50off.pro/contoh_rpp_biologi_sma_kurikulum_2020_revisi_2020ja2xq.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/UAfNXif/restaurant_story_2_mod_apk_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/HgjEjcL/95709524941.pdfIn PDF document text
    • https://cdn.sqhk.co/lalamiteliw/deeidge/81600911654.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/after_effects_cc_2020_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/cTwz6It/64478245764.pdfIn PDF document text
    • http://martans.space/xemizuweruvojaxoxinujadcw72.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/canon_7d_specifications.pdfIn PDF document text
    • https://cdn.sqhk.co/rovujesox/45ibJTg/germany_bundesliga_top_scorer_2019_20.pdfIn PDF document text
    • https://tirusagoxavux.weebly.com/uploads/1/3/5/3/135329940/0d7b07fdace70.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/jiakPhe/zusufu.pdfIn PDF document text
    • https://cdn.sqhk.co/gevanadu/ZDTwAjb/2449334532.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofijanititad.epizy.com/85517083364.pdfIn PDF document text
    • http://fajegefifozibe.rf.gd/data_structures_through_c_solutions_by_yashwant_kanetkar_download.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_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 5304 bytes
SHA-256: bd96a126701c01af0a859c8305f2a9e1a47db39f6a860a5c6a5d5eb254498de2
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 10488 bytes
SHA-256: a2bad061e0a034354e7830ef2acee753be80a5b2ff52d3f424d872c1bbcfef56

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