Malicious PDF — malware analysis report

Static analysis result for SHA-256 975b95fa234400d6…

MALICIOUS

PDF

67.3 KB Created: 2021-02-10 02:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a1f57747edc804b672998f9834e7946f SHA-1: 54636194bdd6bacb0117a31ef7b8bafbbcff5aba SHA-256: 975b95fa234400d6e6cf5bb715f630e3d747f03e94e43d7a40171bcb9a9e5a2a
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 0.9998

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://leonvi.ru/123?utm_term=brake+flaring+tool PDF link annotation
    • http://naturmilans.fun/aircraft_of_world_war_ii_jim_winchesterz5g3t.pdfIn PDF document text
    • http://covidcapsule.world/world_of_warships_blitz_mod_apktc62m.pdfIn PDF document text
    • http://matroskin.space/158077725784er97.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/realidades_1_capitulo_2a_las_clasesl7mff.pdfIn PDF document text
    • http://yourlivehelp.com/un_tubo_de_cobre_tiene_un_volumen_de_0.009_m3_a_10_c_y_se_calienta_a_200_c7v9ns.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_6008e9900fc15.pdfIn PDF document text
    • http://wazofos.iblogger.org/39089936494.pdfIn PDF document text
    • http://lerob.info/83568659081m7d4t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_601583c027480.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/iBjfYv3/jizirodabuxofigewaf.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/L3jjLjf/57784222742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367940/normal_5fe5a2265dc0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488315/normal_60082630946f4.pdfIn PDF document text
    • http://wgathering.org/how_to_calculate_acceleration_due_to_gravity_using_simple_pendulumbtb9o.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
    • http://vamivesuger.epizy.com/eye_cloud_camera.pdfIn PDF document text
    • http://redaxuruzojogod.epizy.com/309528495.pdfIn PDF document text
    • http://dosevidi.rf.gd/beresheet_hotel_restaurant.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_off0000c1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AF 4660 bytes
SHA-256: 934538ab1a57bcb241ec0615b3ae66f7fed06fea16e259a18fdaa9b8df2879fa
font_01_sfnt_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 9616 bytes
SHA-256: 4fa1f6cc4713bbd1212179506c692ee4c7d68e8f1581fa379a8781aaf83ad521
font_02_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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