Malicious PDF — malware analysis report

Static analysis result for SHA-256 304813343ead7b63…

MALICIOUS

PDF

88.4 KB Created: 2021-05-19 06:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7a033646a9bed203772366e4e99e52f5 SHA-1: 3140edc2579dc538ceb746e8501e2a7735d9ced2 SHA-256: 304813343ead7b6313a2553081204d37d4acb93da318b1d49da7a51d1ac2ef5c
126 Risk Score

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 0.9989

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://midufefew.ru/strik?utm_term=how+to+start+bosch+300+series+dishwasher PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489734/normal_6068eb8c35ef8.pdfIn PDF document text
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/wazajiguf_foropemapixawe_napefemu_xugojoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_601d91367fd16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_5fe620bdbfac7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413980/normal_5fc6dce64534f.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/pepibakeniripetomil.pdfIn PDF document text
    • https://fawezodotemo.weebly.com/uploads/1/3/4/8/134871545/gadevepebokuder-pivufi-lodomimapazuf-fibakuxoj.pdfIn PDF document text
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/menoz.pdfIn PDF document text
    • https://nezopubetuw.weebly.com/uploads/1/3/2/6/132681339/743784.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/4f17d3a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410953/normal_601c5e7e5f93f.pdfIn PDF document text
    • https://gowoxavakuf.weebly.com/uploads/1/3/4/7/134702457/vejowunajaxov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_604fbcf333c9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5fe2adfa70d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481993/normal_6028715878b28.pdfIn PDF document text
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/jelake-mogerew-pumamivavugoz-xuginibesani.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nutanigonu/if_not_winter_fragments_of_sappho.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305c5557-708c-4bcd-89fa-ea29da04b655/what_is_the_importance_of_a_chemical_equation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44b00a7-d1e3-4b03-af93-c24e9fed74a0/how_to_work_legs_with_resistance_bands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1899123-47c5-4f98-9902-554b01ff4565/what_safety_programs_are_required_by_osha.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/sefuvusesufopotupujilot.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/ponniyin_selvan_mani_ratnam_movie_cast_and_crew.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/58903277673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21da9755-3e1f-4f00-bae0-fbbb24fdc9c5/how_to_motivate_yourself_eat_healthy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cddc990-52f1-4a5c-a31d-d2f06940774e/37001949548.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 5176 bytes
SHA-256: 03260afdd03816f4d91fc921a64b3b28b816cac1d545ced513ba1b4e846d316e
font_01_sfnt_off00011e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 11000 bytes
SHA-256: fd4b6bf36c138ef5affc380524ecf6b2a53bcdffd3dd3fc0e691f1951c0c2bae
font_02_sfnt_off00014384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14384 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230