Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8b9c6760040c74…

MALICIOUS

PDF

120.8 KB Created: 2021-06-09 19:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 96ffc3ac61c1181ecc26a3bfabdac9f0 SHA-1: b807a35259827d7e513fbed79f8850c263a55fe5 SHA-256: ba8b9c6760040c7478d5883e399bfafb7c29f0b0b12369850ae2cf0ff597125a
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 0.9995

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://jumiwimov.ru/123?utm_term=eclipse+absent+line+number+information+breakpoint PDF link annotation
    • https://rukeruxesam.weebly.com/uploads/1/3/4/7/134700508/1692675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_5ff89e40d6511.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/8553316.pdfIn PDF document text
    • https://kekisuganuzab.weebly.com/uploads/1/3/4/7/134721312/2d4d4934d.pdfIn PDF document text
    • https://judixanasagik.weebly.com/uploads/1/3/4/6/134688655/478843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5fe849ee2013b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_605ae56f5dff1.pdfIn PDF document text
    • https://wixumiwob.weebly.com/uploads/1/3/0/7/130776296/tijudel_roropitinovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_60159f4c03cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_605df5921d337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiwonotexo.pbworks.com/f/cch_ti_alight_motion_pro_ios.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144456297/is_splat_hair_bleach_good.pdfIn PDF document text
    • http://dokajawema.pbworks.com/f/85684211063.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/vazigi.pdfIn PDF document text
    • http://sawanixum.pbworks.com/w/file/fetch/144521853/lopujakan.pdfIn PDF document text
    • http://tekitejug.pbworks.com/w/file/fetch/144541656/58241942309.pdfIn PDF document text
    • http://kufavuva.pbworks.com/w/file/fetch/144716748/10_ejercicios_resueltos_de_molaridad_quimica.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144569076/compound_inequalities_word_problems_worksheet_with_answers.pdfIn PDF document text
    • http://veweran.pbworks.com/f/nusugel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a507cd8-5e87-4152-b7a1-4f2062b560b4/char_broil_barbecue_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5e6d2e-bbba-469b-bbbc-7bf9d3dc0e23/what_is_the_herbalife_21_day_shake_challenge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2a5300-0c32-4145-83e0-9613a2b671cb/40681764667.pdfIn PDF document text
    • http://namebitepu.pbworks.com/f/sesuwekedez.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/w/file/fetch/144531666/greatest_common_factor_worksheet_grade_4.pdfIn PDF document text
    • http://mujusevo.pbworks.com/w/file/fetch/144479364/t_harv_eker_net_worth_2020.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_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 52412 bytes
SHA-256: bc3d983a4720d6dda5edc4f94841056be8153514e6fd466a84a108c18e408e1f
font_01_sfnt_off00019882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19882 5324 bytes
SHA-256: 0d2aa18fc76c217997e08b147b8d968d6a8bca4bad6304c6281183e3f8246b7f
font_02_sfnt_off0001aa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA8B 13056 bytes
SHA-256: b9a87d0af66dd4a1122bf77b45f6cb2420cade741b2313bea1fff55a22d94151