Malicious PDF — malware analysis report

Static analysis result for SHA-256 810f0d5fb2ac50f8…

MALICIOUS

PDF

78.0 KB Created: 2021-06-04 21:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7edf7995d4872add0f4c7d63f05b8138 SHA-1: 935a81b95524f4e0d5a424c0c281b2c5273c8de8 SHA-256: 810f0d5fb2ac50f8bc89c57db3b06d4e3ba14e2607d515dd5f917da8c507ee73
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://crewmak.ru/pbw?utm_term=bill+of+sale+form+texas+dmv PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373770/normal_60041c8f568fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_60681e6deba99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498702/normal_6058fd80db163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420013/normal_5fe2a01d79688.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4462066/normal_60b40a36b9352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5ffc31854bb21.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/e76e8182-ddd2-4771-a3ea-ba8ce42a002c/hoover_powerpath_carpet_washer_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2f2e50-584c-4cec-b1c8-eb884496fc55/how_to_beat_plague_inc_prion_brutal.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/rebaliwomax.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144487677/bunupetomuvikuxatomoritu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bbe9e9b-ac5d-422c-b079-5870d5ba206a/fivozabosisovul.pdfIn PDF document text
    • http://pijipusap.pbworks.com/w/file/fetch/144478314/how_to_adjust_volume_on_tozo_t6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c2c5c6-dc0f-4ecc-bac0-0f88db7614a2/netgear_n600_wifi_cable_modem_router_not_connecting_to_internet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ce159f-6a0c-45ea-92e4-c0314ce4a092/how_to_build_your_own_target_stand.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/f/types_of_lens_used_for_correcting_eye_defects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e71e46b-c0cb-4fec-a3e0-a8d1ba36a0c1/36196096907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd4f65e-29d8-4dca-922b-3e3d7da0bbb2/xepamoxesexunaxugezimaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baaa31f9-d3c2-4b46-ad74-f291a38765d1/pirates_of_the_caribbean_piano_guys_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c269a9d-cef7-4299-99e0-06cfdb4c5969/portal_do_corretor_da_bradesco_seguros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab0c83d-e0db-4752-be25-a0b58dce05a4/67398498296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071df734-9132-4bad-b4f8-fbc5a26e7317/what_are_two_products_needed_for_cellular_respiration.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_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 5228 bytes
SHA-256: 24e452041929fecfc1b2447db776c5e44f2db67dbc1aef61b72faa920d0802b4
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 10616 bytes
SHA-256: b4edf410232bba6eec967f701f2b3f07a11da57701801a39b3450578a74858d2

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