Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e02967bc6a191a8…

MALICIOUS

PDF

74.2 KB Created: 2021-04-23 03:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b121876fada5c53f673676e0ed18da92 SHA-1: a91439d5d8c3fed277a85c3ab93ecb313b41f991 SHA-256: 5e02967bc6a191a8e484a38c177591c678d210227627af1cd7678bc20b48bcfd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or phishing. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, and the ML classifier strongly suggests maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://druttle.ru/strik?utm_term=how+to+answer+awkward+interview+questions PDF link annotation
    • http://bcpzon4segurabetaviabcp.com/8468120915dda2l.pdfIn PDF document text
    • http://all-host.site/101012099722jq8s.pdfIn PDF document text
    • http://brumbum3.xyz/kanawha_county_schools_wv_pay_scale6t3s8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/correlation_vs_causation_worksheet_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/mulete.pdfIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_ab4aafab0e6f4fdc9408fa5f5c930348.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/54954568275.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/59382862632.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/widenumimekotato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c67f03-944f-498e-b415-4a1c5f7f9aca/what_is_worse_viral_or_bacterial_meningitis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4672835-bfe8-4b14-8585-3d7ad9751731/vintage_vox_ac15_amp_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e24b70d-7ed5-407a-b675-f7e006d7613b/brother_hl_5450dn_drum_error.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/how_to_open_a_midland_walkie_talkie.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/grundig_s350dl_antenna.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/sst_answer_key_2019_nts.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/dreamweaver_software_for_html_free.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_626c58d8c6704cbca2a73abf0f9c596a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/bexomadipixumo.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_67fb651151bc4fe7aa5a8ad21848cd5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dace82d4-b1e3-4f02-9713-808f341ccb09/vigadulelovamusadunoko.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_882044c6282d4a2aae83724d260e2482.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_92d374b94a2848849296da5c3cfa02cf.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_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 5092 bytes
SHA-256: e473cfe67fb3e11c4eb7fd11d304a719ef7700eb0291e08ac1b8f91b7167dbb3
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 11188 bytes
SHA-256: 03d91c7f8be4f36550965f24cca520a15e4bb54365f42be7c3b98441656eff6c

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