Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d4d7cf59fa623a…

MALICIOUS

PDF

75.7 KB Created: 2021-03-22 19:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: be706e638ef4f57e08a32b6077682e2f SHA-1: 115db0ac74f71d9a3f982630855a618b7ed2fee5 SHA-256: 16d4d7cf59fa623af020d09384cd0afe8590759ad9c80dc75681e29dfdadb83b
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=bed+sheets+queen+size+walmart PDF link annotation
    • https://cdn.sqhk.co/wuvotalek/YjjzoDY/vugupazokepabaperuruwa.pdfIn PDF document text
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/tasanetidaxigim_noxegu_rapetalo_pelexupatuje.pdfIn PDF document text
    • https://cdn.sqhk.co/jiliroba/j3hbgiK/rome_2_total_war_politics_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421934/normal_5fdf2c5ec5423.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/KejiiAo/73886546665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_603d9e1e48f46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460228/normal_6006afd9bba80.pdfIn PDF document text
    • https://cdn.sqhk.co/kafodarifab/dhaihje/luvomaretarimegufupa.pdfIn PDF document text
    • https://japafapu.weebly.com/uploads/1/3/1/4/131437770/7e47c7394c551f.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/xRhiygf/munokujimewawadugerowo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_6005fa3db931d.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/hjSmSif/2xl_mx_offroad_apk.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/5123173.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/3SWrjlR/real_color_mixer_apk.pdfIn PDF document text
    • https://lekinimogasujif.weebly.com/uploads/1/3/0/7/130739945/daxuvekurizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482415/normal_5fdf025d4013a.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/cjihidh/ss_cable_recharge_online.pdfIn PDF document text
    • https://vevuduwas.weebly.com/uploads/1/3/0/7/130775740/1062042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_ce469f5127f84319b4ac3c2bacca6456.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_eeac0fa239fd43b382dc51c2a9970e05.pdf?index=trueIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_ef1d16c0287849baab5c381537fbe09c.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_546e2bca167341228113cef476d0cdea.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_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 5384 bytes
SHA-256: 8e76f927567101b7e05be5191d6db40b7de9cafce547d24025f10d12cd654dc6
font_01_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 10924 bytes
SHA-256: ce711dde89b9419d7502016f01afd4498ce3f88ad34dc2e5c8633775b673445c