Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a0f8c9ba3fcea3…

MALICIOUS

PDF

72.7 KB Created: 2021-03-12 08:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 65f42ea3fa0a85fc27d94ec08aa9143e SHA-1: c0ea17da8ba9cbd8c5d8882174b4b1cdb517d358 SHA-256: 55a0f8c9ba3fcea342732f020a6ffea41f551093c22254a338acf7fa2ce62a3c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/wix?keyword=free+movies+2020+full+movies+english PDF link annotation
    • http://kugitipozad.22web.org/2003_dodge_durango_lift_kit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_60315f6c94011.pdfIn PDF document text
    • https://cdn.sqhk.co/tevenijubuso/jd6AhdB/grammarway_5_with_answers_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383678/normal_6016d2a63557f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_6039afc3b248f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488135/normal_6024fc46eeda7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5ff1447777038.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/ejajbf2/51610144021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_6029df716020e.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/isnHgh1/affinities_of_herdmania.pdfIn PDF document text
    • http://clubstore.info/ps2e_bios_location_androidyziye.pdfIn PDF document text
    • http://instasurprise.online/boy_scout_popcorn_2020_prizes7epkv.pdfIn PDF document text
    • http://kismykeitio.best/billu_bar_bar_full_movie3emfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://maxumuvekem.epizy.com/jososofegokemipa.pdfIn PDF document text
    • http://jimotomalugeji.rf.gd/si_usman_ang_alipin_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f916012f-a7ea-403f-a839-abd389b5c91b/day_trading_with_price_action_galen_woods_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4701a058-f91b-4ed8-854b-8f329590cba6/how_do_you_reset_a_netgear_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1226a1-7621-4666-9849-d24ef99cf6ec/samsung_galaxy_s5_active_microphone_not_working.pdfIn PDF document text
    • http://delorikafuba.rf.gd/semi_formal_dresses_brisbane_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee2cc08-b1c9-449f-8054-f6d21c7699bb/1552601914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f26b74d-cdcd-49b0-87fa-265e1ce965df/93723974586.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 5064 bytes
SHA-256: 87099337efc036b33d2004768842c33efe0ad04748237c70019803aa6e051410
font_01_sfnt_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 10136 bytes
SHA-256: 3c54d4813a4e91f3d8bda309fdac93e62002be0b089dd5720635754353f38fad
font_02_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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