Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb21b5c9e91fe4bc…

MALICIOUS

PDF

77.1 KB Created: 2021-05-04 09:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 94c3155eb0369709d7ae3133045ab2c1 SHA-1: 6b862510d609151dd11168689168cc165fa38e07 SHA-256: bb21b5c9e91fe4bc42731ca3b6bd1d91fd61ecf3d93a87d691fa2d4005edc4bf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a search query that serves as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=where+can+i+buy+zojirushi+bread+maker PDF link annotation
    • http://bostpolamos.site/96759474246u69rw.pdfIn PDF document text
    • http://khareedforosh.com/ct_1040x_instructions_20164cfur.pdfIn PDF document text
    • http://sesalon.xyz/1100_words_you_need_to_know_week_2_test5xt2l.pdfIn PDF document text
    • https://cdn.sqhk.co/tuforalogidu/sOXGWhe/pixel_car_racer_tuner_body_kit.pdfIn PDF document text
    • http://mirror-x.org/31554874749kz7jn.pdfIn PDF document text
    • http://jodopafipunew.22web.org/vezokaromijatadewenofogo.pdfIn PDF document text
    • http://leoidet.xyz/1463190277p2uyj.pdfIn PDF document text
    • https://cdn.sqhk.co/puzukebejas/2gdjf1v/catchmaster_insect_trap.pdfIn PDF document text
    • http://relax35.ru/what_are_the_different_types_of_trading_strategies8p42w.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/jgcsNih/10845365463.pdfIn PDF document text
    • http://mrshadow.net/84344407120yrkbd.pdfIn PDF document text
    • https://cdn.sqhk.co/wanuvudeb/diduVW2/among_lock_screen_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_27b5cd93a3924409a844897d2d7543c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27a2d37-4f0e-4a6d-bb17-eccf343c8bdb/the_motorcycle_diaries_screenplay.pdfIn PDF document text
    • http://gesulobanaxa.rf.gd/aspergillus_flavus_morphology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fc1147-fcab-42cc-baf5-4bd065a51a0e/77720904375.pdfIn PDF document text
    • https://e191375a-959e-431f-84a9-a18a669eb879.filesusr.com/ugd/3283b0_69f1f7ccd614453699b1141a7548c555.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_58c0b6e2e5184540b2a14bcb2db891d9.pdf?index=trueIn PDF document text
    • http://gunagiweraji.rf.gd/moxibepaxukupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913bac4c-fa0e-4b72-8f1d-0ed344e597cb/werewolf_totems_white_wolf.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_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 5592 bytes
SHA-256: 3ec988e7c5341c6f19bcb7b8d9fa8572074d1fc3f624141ab456e58ad74a19c8
font_01_sfnt_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 10536 bytes
SHA-256: 0d339b983093d11062f4c723dcdb7b2818f0008c412801afda034b2b23d41d80

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