Malicious PDF — malware analysis report

Static analysis result for SHA-256 53291fe8e561f699…

MALICIOUS

PDF

71.5 KB Created: 2021-06-13 13:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e452da98c1ad231b8be7bf0142ef726d SHA-1: e641c42595fa46163b3b2a09e72b34399e4501b8 SHA-256: 53291fe8e561f699520f6d539afb8b1ae26f02723bb12938de131d854b492291
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 hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://medvor.ru/pbw?utm_term=gmo+animals+pros+and+cons PDF link annotation
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/gilegature_gajopulijemuwul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_600e137735553.pdfIn PDF document text
    • https://fowedejuman.weebly.com/uploads/1/3/4/5/134518602/kosojiboviguxem.pdfIn PDF document text
    • https://xuravamu.weebly.com/uploads/1/3/2/7/132740838/6190638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421056/normal_6019b6c9a4892.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/makujepeteza_xamexirezutar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_6066aa7895c13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_604850d83251c.pdfIn PDF document text
    • https://jidegumot.weebly.com/uploads/1/3/0/7/130776526/muviva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jalosozamiz.pbworks.com/w/file/fetch/144705159/take_five_piano_solo_sheet_music.pdfIn PDF document text
    • http://rizukokodi.pbworks.com/w/file/fetch/144797625/what_is_the_difference_between_leaf_structure_in_monocots_and_dicots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d52ac9d-b928-4762-8cff-9e6fb3e3ce43/zavev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0db8d46-fe2f-405f-808a-ef9d3dd155aa/miller_syncrowave_200_settings_for_aluminum.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144468150/5452885196.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144566181/lomewipik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c039da7-0fe4-4069-871d-f7e128038695/mean_median_mode_range_worksheet_and_answers.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/65328588562.pdfIn PDF document text
    • http://vowijeve.pbworks.com/f/gumevipo.pdfIn PDF document text
    • http://kosumepifise.pbworks.com/w/file/fetch/145240287/editable_april_calendar_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ee1812-608c-43c6-9b7f-74cedc19a4c9/can_i_wrap_my_own_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7be850b-7658-4b7a-b376-081a10f291d5/xanathars_guide_to_everything_magic_item_tables.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144661068/mario_3d_world_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36dfb9f-1c87-45c1-af9f-598b3353f9cc/pride_and_prejudice_bbc_1995_dvd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4eca7c4-17c3-474b-834d-fcddc4a89665/adventist_healthcare_home_care_services_silver_spring_md.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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 5252 bytes
SHA-256: f7f08f20891526c79157158101fbc8a7fa78e227c819ddc6f705933e1c4564ab
font_01_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 10368 bytes
SHA-256: 5c62126f40574f3e82b7d5cd2d6de177fa621f507e0d00ff32cb5a72ee61646b

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