Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55eeebc96476578…

MALICIOUS

PDF

77.3 KB Created: 2021-05-04 13:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a44140f2f18f88abaed9bed31ad1df80 SHA-1: c8156ddcf920b2b9d0092b2d27118accc0d33611 SHA-256: b55eeebc96476578c39e44a5164812f0f0e6d7324434dcc5d71cd6592fc01b20
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier strongly suggests malicious intent. While no scripts were directly extracted, the structure and numerous external links point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://soxebez.ru/strik?utm_term=how+does+written+in+my+own+heart%2527s+blood+end PDF link annotation
    • http://sodahq.pro/902894197766088y.pdfIn PDF document text
    • http://ejqy.com/praise_and_worship_songs_list_nigeria64jzi.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/kijVdgh/47244672954.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/T3hfjdL/wordplays_scrabble_word_finder.pdfIn PDF document text
    • http://ouily.xyz/king_betting_tips_appfwrri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486535/normal_5ff6505da14ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465564/normal_5fd30a0cca067.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/fqnHIhf/horse_riding_games_online_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lepapina/5jjiija/rabejaxobamevibapax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_601047fa703f2.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/fthbMe5/porobokuw.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/cwdkfsE/76630300277.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofebiziv/iDegIWA/4_pics_1_word_7_letters_cheat_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/bumozokal/haLjfgc/tosibivumakutapizer.pdfIn PDF document text
    • https://cdn.sqhk.co/doxufojixene/igjKgd1/28202207078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tamakibegotilo.epizy.com/grobag_tog_guide.pdfIn PDF document text
    • http://vafukibugaf.epizy.com/bhojpuri_album_song_dj.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/new_audit_report_going_concern.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/mujagusobipogumamakenarev.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/omlet_arcade_cracked_apk.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_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 5392 bytes
SHA-256: 195b46d078bd86bce3dadbaff56212a378b570cc64b294ec7c42c6acd7541200
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 11272 bytes
SHA-256: 804482765cf9a62169f4329a17c2c0f5e3b23b15286693dc30df65385014144e

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