Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9b1886c1288824…

MALICIOUS

PDF

73.6 KB Created: 2021-06-02 19:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a258171987727fbee69074f35273a852 SHA-1: 94c0d4f35fedc0083ceb3f79993b8a957d64b92c SHA-256: ea9b1886c128882409286172935b666e92be86a0ba91e80a64fa3f2dd3e0b0cf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to other sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and link farm behavior suggest it's part of a larger malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/pbw?utm_term=ejemplo+de+acta+constitutiva+de+una+sociedad+civil+pdf
    • https://xududegugi.weebly.com/uploads/1/3/1/6/131636960/sedibuwotutekefazibi.pdf
    • https://kagesurofuzesik.weebly.com/uploads/1/3/5/3/135303772/1617461.pdf
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/6038244.pdf
    • https://cdn-cms.f-static.net/uploads/4454047/normal_60417b1a51b5c.pdf
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/1490247.pdf
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/01e12b27589.pdf
    • https://xemifedawunata.weebly.com/uploads/1/3/0/7/130775780/winekibexofatupiri.pdf
    • https://gatobutapasi.weebly.com/uploads/1/3/4/3/134364099/953ae000412bd7.pdf
    • https://gikotibosad.weebly.com/uploads/1/3/4/3/134332820/6323118.pdf
    • https://cdn-cms.f-static.net/uploads/4414360/normal_60388872e6ca2.pdf
    • https://cdn-cms.f-static.net/uploads/4454303/normal_60138a4c95e89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/36316c4c-6a95-499e-adb0-0c37c51ed59d/wivelameza.pdf
    • https://uploads.strikinglycdn.com/files/e2e0532d-97a7-4f5d-bc91-1f88f90f0501/what_is_the_psychology_of_colors.pdf
    • http://sutodoromar.pbworks.com/w/file/fetch/144514950/casdon_dyson_toy_ball_vacuum_cleaner_instructions.pdf
    • http://mujefapufefi.pbworks.com/f/congressional_committees_questions_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/e6fff1a7-65bf-48bf-a873-ee09e97505e5/81884479483.pdf
    • http://mapaduzipi.pbworks.com/w/file/fetch/144506274/alternate_corresponding_angles_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/dec3cac7-9e2b-4d22-b191-0b45dc331148/lev_vygotsky_theory_of_constructivism.pdf
    • https://uploads.strikinglycdn.com/files/ce4baa68-c25a-45e6-be2d-f9108bb9d519/candlestick_charting_for_dummies_free.pdf
    • https://uploads.strikinglycdn.com/files/78b9f8d6-78cb-43f0-8f72-43aaa8b57bf9/best_resistance_bands_for_legs_uk.pdf
    • https://uploads.strikinglycdn.com/files/b2789bb1-4b36-4126-9bed-5f39d344ee8d/33862776515.pdf
    • https://uploads.strikinglycdn.com/files/edf29d4d-ab6d-4201-ae7e-22f876f53255/how_to_clean_carburetor_on_husqvarna_lawn_mower.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2da.bin
e61904f097e292977e27341ffe76060bf2455e8173905a37010f1986305c1ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 5300 bytes
font_01_sfnt_off0000f4e1.bin
b8425c6d87122a7706bcfd4e0ba1d61af5fa537d0e7e55b6cb1b75c620632763		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 11048 bytes

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