Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa8a26d391bd3d1…

MALICIOUS

PDF

83.3 KB Created: 2021-04-16 04:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c82c6f368c72a24ecb56b80c167968f1 SHA-1: 10b5d1a80d8160ebdb70621df12092035085b825 SHA-256: 0aa8a26d391bd3d140e898c7a384926e6a4db1f4c7e6e858e2f7443ac781da14
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • 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=what+are+the+seven+sorrows+of+mother+mary PDF link annotation
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366359/normal_5fcaf0c624d58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_604d71ce4c1ef.pdfIn PDF document text
    • https://cdn.sqhk.co/tilesoxeg/ggjeljc/mewavuxabudenodanikagemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492900/normal_5fe868b7a6bf1.pdfIn PDF document text
    • https://cdn.sqhk.co/poxirowo/hvEO5UW/spanish_word_of_the_day_believing_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/mlE5yic/93395698772.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/umierih/dilizanuwuguxodiwilev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_605b1c4daea14.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/aWjrlgP/audio_pro_addon_c3_vs_t3.pdfIn PDF document text
    • https://cdn.sqhk.co/bibobovezave/ahaQu2t/king_of_war_evil_kinds_revenge_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/jjeieXI/14_allergens_poster_free.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/jefazaxal/boondocks_season_3_episode_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00a2fca-45a8-41ff-961e-2cc7db8e5f0f/excel_vba_select_range_until_last_column.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_6b4e290861554d0b8a415bc0fff8b8bc.pdf?index=trueIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_16e6f531027645ae9d60fdcdd78e4f3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosego/memory_card_data_comes_back_after_format.pdfIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_7245cb8afa2f49d395da0af60b952c8e.pdf?index=trueIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_56b2fc182b3e4309a54e6b5cd8d88858.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/dmarc_email_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4568c158-6560-49a8-88e3-55c6efbc4bb6/ximob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19725ef1-fc68-436a-976d-30f8b70adbf1/arduino_mega_2560_pinout.pdfIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_18e44eadd2c745819b150e008c1be873.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/fesisapaxemovulukavuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/931c3df6-5cda-4960-8302-724a5bd16703/ukulele_easiest_song_to_learn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8035809e-6425-4ff1-8fc8-8e6cc60a1d86/kexinuxerisotimidu.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_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 5240 bytes
SHA-256: 18139be7222e204d0727e6087ecd29b6f738595860ac261fe4eb1d0b3e844336
font_01_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 12900 bytes
SHA-256: c0f626c0450008b74f52f9ae813fd139cc347ad40eaabb2d2f94895022fd7791