Malicious PDF — malware analysis report

Static analysis result for SHA-256 021daed9556bc44b…

MALICIOUS

PDF

75.0 KB Created: 2021-03-21 10:31:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3bc2409cffd30513ea64466243a99fba SHA-1: a004a35cad9389025fb1bd85604122d9ebee27bc SHA-256: 021daed9556bc44b13e4285ec28cd84a25073170da9d52213afcf8bd6858a546
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable hosting or known malicious redirectors, indicating a phishing or spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=la+noire+all+cars+guide In PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/6108005.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/little_fires_everywhere_season_2_episodesqzly1.pdfIn PDF document text
    • http://trastqort.online/top_10_bittorrent_sitesa1lrs.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/fkijSUq/nwsl_expansion_draft_predictions.pdfIn PDF document text
    • https://guniroxu.weebly.com/uploads/1/3/4/5/134525914/lerinutabogilez.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/SSvgc2E/72415980808.pdfIn PDF document text
    • http://expo-kit.ru/39331417073bzi33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6d28ce-bb41-45e8-ade4-89cfdbbfbc14/how_to_restart_a_verifone_card_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f93a79-e6b2-499e-b218-c9340c2bc244/65123015732.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_f1b4b847886f4c58910681f6183e66bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/162a42ab-4498-412a-bb88-dbd7a45fce56/84868272474.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_7b47e6c22fbc4da8aaad7f74bb84dce5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d871b774-9f7c-467c-9015-16d0f613f45a/sword_art_online_alicization_war_of_underworld_episode_14_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a152132b-fc86-4199-97b8-a5ea9bba06ed/tofikewes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b715d8a-b481-4355-ba56-1a30e2fad12f/82440324690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1cfc66d-aefe-4fe8-aefd-4befa00926d0/68061387022.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_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 5048 bytes
SHA-256: 91387c22058e7f7d4aa85e86a4218b2615743d6c24405e6c48fde91308bd6829
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 10432 bytes
SHA-256: 373f61d55eadf9afdbed0221b09990b8677b345775a0200154ffd5eff9ce4a03

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