Malicious PDF — malware analysis report

Static analysis result for SHA-256 9577a399b374b8e3…

MALICIOUS

PDF

80.9 KB Created: 2021-06-09 12:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 20bcfdeb97879dbfc058a07456ab36e3 SHA-1: ca944657f7c3f49b210457d676fdedc92fe0f49e SHA-256: 9577a399b374b8e3e385c1ab1d95c1c887c36b21b615aafb0e48dad85d4d384e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/pbw?utm_term=doki+doki+literature+club+exit+music+mod+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450139/normal_602113efaeb46.pdfIn PDF document text
    • https://fenolipemul.weebly.com/uploads/1/3/4/3/134341818/dorub_wisopuvawas_ginemale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480736/normal_60241ccb11b37.pdfIn PDF document text
    • https://niwurakoj.weebly.com/uploads/1/3/4/5/134588258/ganulin_femadapewunuvoj_gikebi_nunixezu.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/gejejapenazi.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/tijogitis-kegipakekazosa-rezupupu-bimofifigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_605d9ad6e8e6d.pdfIn PDF document text
    • https://nusatugob.weebly.com/uploads/1/3/4/8/134865614/b39edd6dfde0ad.pdfIn PDF document text
    • https://tebudewuve.weebly.com/uploads/1/3/2/6/132683230/gebitaxovisigo-xixisewewoles-zujirerut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6015a1b5d0126.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4016ed43-ec28-4225-b846-79bad9f1b743/birthday_paragraph_for_best_friend_copy_and_paste.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/electrical_wiring_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c80bce0-fc88-4c1b-a770-a4af3238aeb1/toro_power_clear_21_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cffd6bc7-60d7-45a2-85cf-fc9f7c8d5b19/spectrum_reference_code_s0900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae415ab9-c1d0-4310-b6f7-960b12b533aa/bob_revolution_pro_jogging_stroller_best_overall.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/25127425464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7585071-a0ee-4eca-bb68-9d40b379725a/do_i_want_a_real_id_drivers_license.pdfIn PDF document text
    • http://kafunujazuwo.pbworks.com/f/85500547290.pdfIn PDF document text
    • http://sokulus.pbworks.com/w/file/fetch/144655104/what_do_you_get_when_you_upgrade_to_town_hall_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d94173e-1a74-473a-a59c-f091d70f3aff/50294097646.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_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 5448 bytes
SHA-256: 0c89c023c37d7f20f564db2fa68ed32babe4c01606cf12bced092dedbcd47575
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 10952 bytes
SHA-256: 21e32ddb80576088f8b4e8e1611f5faf06db2ce84b46341a7969ed268117c9de