Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fec9b062d3d33b8…

MALICIOUS

PDF

75.2 KB Created: 2021-03-18 07:25:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f4ca94606b55e84e1aee551f70c0f8f4 SHA-1: 396d63abb9cf61d24eca923e8fa6ebb6aca1dbb4 SHA-256: 2fec9b062d3d33b8fc5a0febca0cecf6c9a9f954e524d529870c3a465386e7f1
186 Risk Score

Malware Insights

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

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 0.9991

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/123?utm_term=12+month+calendar+template+2019+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420599/normal_600af4cb3a85b.pdfIn PDF document text
    • https://vonemiwez.weebly.com/uploads/1/3/0/7/130776812/samofiwi_tulokapojavebi_bixivijenogora_gobonuzuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465259/normal_5ff137d30cce9.pdfIn PDF document text
    • https://lexapokugivida.weebly.com/uploads/1/3/1/8/131856754/62cee4547a1.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/gh6p3gg/sky_sports_latest_scores_football.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/jc1khci/cute_animals_cartoon_pictures.pdfIn PDF document text
    • http://usacarins.com/wowivekubolomirijorirony810v.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/Cgjijqz/smart_youtube_apk_android_tv.pdfIn PDF document text
    • http://zoneeuro.pro/hello_neighbour_hide_and_seek_trophy_guide74hbu.pdfIn PDF document text
    • http://lyudi23.ru/international_business_negotiation7y6nz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383806/normal_5fdcc45045382.pdfIn PDF document text
    • https://rifelejoxew.weebly.com/uploads/1/3/4/3/134330737/e590d3600f5d.pdfIn PDF document text
    • http://tvoy-ogorod.online/axial_scx10_3_bodygk6hh.pdfIn PDF document text
    • http://mivegik.mygamesonline.org/51185666623.pdfIn PDF document text
    • http://baderezu.scienceontheweb.net/tibialis_anterior_tendinopathy_exercises.pdfIn PDF document text
    • http://price-list.moscow/loguwafowiduxiwesamaw31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5ff2e36982acb.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/Cjh8YID/consolidated_theatres_pearlridge_showtimes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_d5e06fd3baf64be6818237b25d544841.pdf?index=trueIn PDF document text
    • http://sogivuwe.onlinewebshop.net/66761261071.pdfIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_c84e2e7f99084d69a7e368959f148adb.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_d9f3bebc93da4b6fa83e411b09e401a2.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_36365fb6ec17443bbfc114a78b006a60.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_f733323da93e4e3393e780c1dd8bf969.pdf?index=trueIn 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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 5616 bytes
SHA-256: 9bcd583f79444d414d592eb383971fbc1a31cda937b1dbebb1ee3de9c503f881
font_01_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 10180 bytes
SHA-256: c57e1d58beee7cd3eeaa8899a70d4c2ce4081709cf4093f9471782fa83513964