Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1d69278c6a595e…

MALICIOUS

PDF

68.6 KB Created: 2021-02-22 20:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6da7768638307eec79b8df412930b4c2 SHA-1: 906d2b6151dc9237947ecb7e723004200c60a04f SHA-256: 4d1d69278c6a595e37dee20df707dba54eda07ff7fa0f17a61c7496ee1136ec3
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The PDF contains numerous embedded URIs, with at least one pointing to a suspicious domain (baarspo.ru) that is likely used for phishing or distributing further malicious content. The presence of external URIs and the overall detection profile suggest a phishing or malware delivery attempt.

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://baarspo.ru/wix?keyword=the+social+animal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391909/normal_601a403b9ab02.pdfIn PDF document text
    • http://zolomakowifop.iblogger.org/january_2019_calendar_word.pdfIn PDF document text
    • http://wide-do.top/get_rich_carefully_redditc6wb8.pdfIn PDF document text
    • http://pezamuxajezupe.iblogger.org/15827745260.pdfIn PDF document text
    • http://ketotreno.buzz/boxokimuq2qqk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_601c7349223fe.pdfIn PDF document text
    • http://shoop-fk.ru/268981077741nd1f.pdfIn PDF document text
    • http://unlockdeals.shop/child_care_subsidy_application_formqmxm3.pdfIn PDF document text
    • http://thedefenseforge.com/20828785369z342m.pdfIn PDF document text
    • http://rowajenuw.iblogger.org/90373855447.pdfIn PDF document text
    • http://xudikuruno.iblogger.org/wuguteragazixuketez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dukazaxotak.epizy.com/watch_pride_and_prejudice_1995_online_free_episode_1.pdfIn PDF document text
    • http://risawanidav.epizy.com/ragnarok_m_eternal_love_leveling_guide_hunter.pdfIn PDF document text
    • http://nabowiruxurupob.rf.gd/plasma_cutter_keeps_cutting_out.pdfIn PDF document text
    • http://pirajog.epizy.com/pefutes.pdfIn PDF document text
    • http://juzefabamurever.rf.gd/anne_marie_then_song.pdfIn PDF document text
    • http://belivadu.rf.gd/5760480256.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_off0000d14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14F 5248 bytes
SHA-256: 895be5d47f9b8ea54f083916b6d8f038f86f782f1f9d926a287a3463e52f37bc
font_01_sfnt_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 10140 bytes
SHA-256: 53ed0d60cd517d2af189081c35a45e6ce550a1ae8ce83cd478c56af8b1142df1

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