Malicious PDF — malware analysis report

Static analysis result for SHA-256 17148e36951c7a9e…

MALICIOUS

PDF

73.7 KB Created: 2021-02-23 19:33:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: af93f7cd51553e0f89c7845c8c8d8cbe SHA-1: d3a405cb40e81d1e192ea95c10148ebe14677b30 SHA-256: 17148e36951c7a9efe669faa8bd566e88b94677e996f6770c645f7232c834f01
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://baarspo.ru/123?utm_term=which+is+the+original+bible+language PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473926/normal_602fb7932eee0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409110/normal_6003b6ed77bde.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/fodegejozut-warajajebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_6016c5a1c5db0.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/gofodo-sonufo-zosuvigem-suzamopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_5fe8a427524f0.pdfIn PDF document text
    • http://vezdesami.ru/bombed_last_night_sheet_musicdh06e.pdfIn PDF document text
    • https://mofafodoler.weebly.com/uploads/1/3/0/8/130874416/mafodagujusalusisuso.pdfIn PDF document text
    • http://gebojiwikidavu.iblogger.org/identifying_bottlenecks_in_informatica.pdfIn PDF document text
    • http://coolvdomaion.online/ca_clarity_ppm_timesheetsm4pn3.pdfIn PDF document text
    • https://revininone.weebly.com/uploads/1/3/1/3/131380081/7c757f.pdfIn PDF document text
    • https://menanolunum.weebly.com/uploads/1/3/4/7/134754058/gariz.pdfIn PDF document text
    • https://tisefujuset.weebly.com/uploads/1/3/4/4/134488269/pikukawuril-benexoxev-zoxarawab.pdfIn PDF document text
    • http://limons.space/financial_statement_version_report_in_sap_tcodepirjf.pdfIn PDF document text
    • https://jizimixu.weebly.com/uploads/1/3/4/0/134095846/29c2b2d8da07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jamigiboweb.rf.gd/interview_questions_and_answers_for_office_administrator.pdfIn PDF document text
    • http://figijosi.epizy.com/garmin_zumo_660_gps_review.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_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 5216 bytes
SHA-256: f29a2d6e92ef189d17969387eac68fc930d15b8e06a78e7dd5cdf385b28f719c
font_01_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 11660 bytes
SHA-256: fdf55af57aa59aca293abcdad1c142e2526414af18f2c29d60c6dac38bdbed55

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