Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b47f6276603e41…

MALICIOUS

PDF

74.0 KB Created: 2021-03-06 08:16:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 694a2b034aa08a24b8b806eb1c9ad677 SHA-1: 4d7925d2ff88e7058de792c005bb9cc2e16d12e1 SHA-256: 81b47f6276603e41043c45d57a70d7e22258115ca4307e9dff53800b0fce8953
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a search query, designed to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=what+is+religious+tolerance+and+in+which+colony+was+it+practiced+first PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383170/normal_6005b27730693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_60348ba2450e7.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/44zgfhj/21745547692.pdfIn PDF document text
    • https://cdn.sqhk.co/xidujefonari/hcridMO/leporolukozatuvadog.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/what_is_the_healthiest_bread_at_subway.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/ieM3hdA/jozatusifevitigedu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480905/normal_5fceac3671294.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/dUGVsjj/hitman_2_sniper_assassin_download_pc.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/how_many_devices_can_velop_handle.pdfIn PDF document text
    • https://zaluvunikuf.weebly.com/uploads/1/3/1/0/131070459/topema.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/d3ij8Sa/residual_income_ideas.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/melelawuvowu-wexesopowafipat-waxatinufutarid-didufaneb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_6034c6ca1a5f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/defujo/98365514276.pdfIn PDF document text
    • http://muwuvago.atwebpages.com/49107047894.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/paint_the_town_red_apk_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7aed3c-e6a3-48c5-a745-fe27efdebb4d/how_to_fix_my_schlage_keypad_lock.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/vodululuraxukisewez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c920d8c6-263f-4030-8f0d-b6b3c423e33f/how_to_set_up_monster_illuminessence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde4baca-1720-488d-83f3-10012c24ba14/different_word_for_ride_along_2.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_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 5624 bytes
SHA-256: bebef1f8ea0b0d2c2a6e97f354839c5ef0cb3a39eaaf5d7f7d8272ade35f9a64
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 11092 bytes
SHA-256: 277d0b18391355356aad318341d84f5510377243043d648bf4556784d61d5515

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