Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc98583187850cfb…

MALICIOUS

PDF

76.2 KB Created: 2021-04-05 08:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 836f3b2f20b9c203267ebc3cb0a6115e SHA-1: c10c68258f1620ebead98eefef19ddb6b4dad2cb SHA-256: bc98583187850cfbd698809e3677852f8301570d7ae338e5701dbe83932c5eec
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL leading to a domain associated with phishing and malware distribution. The heuristic firings, including ML and ClamAV detections, strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'executive book summary speed of trust', which is likely a pretext to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=executive+book+summary+speed+of+trust PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418777/normal_6014dec814160.pdfIn PDF document text
    • http://zefefiwova.medianewsonline.com/84050420310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369305/normal_60086f31aad6d.pdfIn PDF document text
    • http://ketorebagibof.22web.org/8253990848.pdfIn PDF document text
    • http://terugesit.iblogger.org/how_use_google_maps_offline.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/luzirufevirilakogunazaxuv.pdfIn PDF document text
    • http://sewukagazub.mypressonline.com/activity_joc_cartonase.pdfIn PDF document text
    • http://bukipanugub.iblogger.org/mixels_games_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_6064d7c5d8225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowageg.onlinewebshop.net/cardiopatias_congenitas_neonatologia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53bf4b58-738f-4089-bf39-7b80f6c41691/25809255224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b789329e-1321-4a21-af4c-d2931774e2c7/when_was_the_lenovo_t420_released.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5b58f5-66e6-4467-9a73-8d901a8d27f2/bikejatubufimafexezaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd95f7d-5c5a-46a0-b312-fb658595dd30/30805358151.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/ocarina_of_time_walkthrough.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/badogapu.pdfIn PDF document text
    • http://fipuzugajan.epizy.com/apa_referencing_style_6th_edition_2020.pdfIn PDF document text
    • http://dipumekamerara.rf.gd/mufevosabenutewulukufuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ccbda91-7800-40ad-b2c1-569d942137ce/vuragosevakagawel.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/25938974043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d23b919e-103f-4a89-ad65-f0e938da7ec0/how_to_put_a_logitech_keyboard_into_pairing_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e5a780-1c9a-4afd-aa18-c499f764e579/81053274953.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_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 5660 bytes
SHA-256: 38f68a9051c1745575a1b3b3717baa1879c63936ae725ff401166911d1253abf
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 10212 bytes
SHA-256: 50ab63ff1b1dca69fdd7043832d685bebc99e1a882d4cf4c819762e90ecc6f98

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