Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bdbcf5a027e47a…

MALICIOUS

PDF

71.5 KB Created: 2021-06-11 00:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3da82d2ae99d5346c3a80c37bbe010f2 SHA-1: ce8a1d44faa1b21e4437354a27eb56f33f04a67e SHA-256: 68bdbcf5a027e47abb52f24c3871a8361ae1ecfdd4bd9a0267aa65b7d0110c4d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the embedded URLs, 'https://inwebjor.ru/pbw?utm_term=record+pc+screen+with+android', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/pbw?utm_term=record+pc+screen+with+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5fdc895fdb28e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fdee70e2b8a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454300/normal_60c0d0c4a2e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_604f147b861bd.pdfIn PDF document text
    • https://keboxatoxumire.weebly.com/uploads/1/3/4/5/134591907/fifusujazideweziwil.pdfIn PDF document text
    • https://nuvugokub.weebly.com/uploads/1/3/4/0/134016684/vuxen-dufipol-ronirubaboma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_6067a4df264b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_603e90f9c7c68.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4375525/normal_60b7210b65234.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/168e6d50-7b7d-4962-91ec-6a847800653a/21483431444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73cd7d87-e698-406e-8308-d77640bb386f/what_are_the_3_components_of_theatre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9ddcdf-a559-417f-b96f-c83c1e4c5b07/sex_positions_with_broken_femur.pdfIn PDF document text
    • http://xudusuvo.pbworks.com/f/xanudofenutovinibevus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3801160-3fe5-45d3-a3ac-cc86704b2d9d/vuvixuzefajed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0013b9e7-9cde-40d5-8ed0-552d12508eab/rt-ac68u_aimesh_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bddc3d2f-2ce3-42d6-a7e8-7901aa82e94d/23360561823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0118da-eec5-4902-a298-45659548f211/blender_tutorial_2.80.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/f/geni_zet_karma_program.pdfIn PDF document text
    • http://gokuluxitup.pbworks.com/f/28539725552.pdfIn PDF document text
    • http://posonuxe.pbworks.com/f/lupoxonevidugufaxuwubut.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 5228 bytes
SHA-256: e4905d05fa0d7b397d735e0df14e85081b2fddde70aeaa36f20cf4f0c5a2e8a5
font_01_sfnt_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 10752 bytes
SHA-256: 1aa890cd8437365c318b1f81972fac9345f963b3f87960c2a7ec0d20d5b28ac4