Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c2e9bb6c7613e3…

MALICIOUS

PDF

72.2 KB Created: 2021-04-03 23:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c9202f3e56ccaba31926d20924ef8b1 SHA-1: e4beb8003b229113af4fc51843bcbaad95a37170 SHA-256: 65c2e9bb6c7613e3e8d5fc715d0c73fba8b0b4f73fe596849c0db0b04f9b351a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and acting as a link farm, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to its creation by wkhtmltopdf, but no clear textual lure.

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://jacksth.ru/strik?utm_term=polaris+side+by+side+170cc
    • http://instapriz365.site/zikokariviloluwemoeo461.pdf
    • http://befigter.xyz/qu_da_cae_domingo_de_ramoswjlg4.pdf
    • http://mozovurezet.iblogger.org/exercices_adjectifs_demonstratifs.pdf
    • http://nakanilo.club/xozorardeoc.pdf
    • http://betagirut.iblogger.org/73431939895.pdf
    • https://cdn-cms.f-static.net/uploads/4443810/normal_600c14b596675.pdf
    • https://static.s123-cdn-static.com/uploads/4407316/normal_5feec391dc71e.pdf
    • http://bewujasixi.mywebcommunity.org/income_tax_return_acknowledgement_2020_17.pdf
    • http://importants.space/how_to_thin_paint_for_wagner_sprayerp444j.pdf
    • http://wegansit.space/wetaj9hnr8.pdf
    • https://cdn-cms.f-static.net/uploads/4387241/normal_603e9e97dbc35.pdf
    • http://naturebiolog.fun/mikajameboxire7irj8.pdf
    • http://balifruit.com/487253697729zchu.pdf
    • http://getne.xyz/ibps_guide_gktfhv9.pdf
    • http://myfavoritesun.xyz/how_to_play_classic_games_on_pcddoq7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fudotebu.epizy.com/apnea_del_sueo_2020.pdf
    • http://gizenelik.rf.gd/malinconia_ninfa_gentile_bellini.pdf
    • http://jefitanebigovun.rf.gd/comparing_decimals_worksheet_for_grade_6.pdf
    • http://xuwugufufokiti.epizy.com/skype_7._40_free.pdf
    • http://gototura.myartsonline.com/venipobitifosozigasikebu.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_off0000d55b.bin
27c6dea767b731a19b67811478640735a9f9660afbcac20b4113632a838d4759		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 5448 bytes
font_01_sfnt_off0000e802.bin
b5d01f328de2819016344697777586c3effc64580efc7de7548f05fafd3702af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 13932 bytes

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