Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6943ddd9b3d59ed…

MALICIOUS

PDF

80.4 KB Created: 2021-03-02 06:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 78ad9cbf55d3c3c6d65c4ef04c6953d9 SHA-1: 54cdd96840bd41f881f674452ee4ab2d49cf866c SHA-256: c6943ddd9b3d59eddef505143932a26e218002d22c7440d2870c9bbd66737a2e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=kenmore+washer+110+parts+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418574/normal_601bde57dc8b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_603b4ab7c2b59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_5fde9c052873d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380545/normal_60039f530c0c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_60264d1b9bb9c.pdfIn PDF document text
    • http://bipiraxas.iblogger.org/41632744958.pdfIn PDF document text
    • http://ruvaruvifovuk.iblogger.org/kepiz.pdfIn PDF document text
    • http://manipiso.iblogger.org/how_to_trade_bitcoin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_601c8866c56a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gunubaxerilol.epizy.com/sitamazorip.pdfIn PDF document text
    • http://voxafizuvukulam.epizy.com/95029281833.pdfIn PDF document text
    • http://vogasuzifen.rf.gd/83881747537.pdfIn PDF document text
    • http://vawujularow.rf.gd/iiser_aptitude_test_2015_question_paper.pdfIn PDF document text
    • http://metukobitoro.rf.gd/gixewodomonodalutamefu.pdfIn PDF document text
    • http://bosirizowu.rf.gd/juvevibekalogisediparo.pdfIn PDF document text
    • http://pejibuturu.epizy.com/bojisajoziwuwuxeki.pdfIn PDF document text
    • http://pamegapag.epizy.com/vegas_pro_free_for_windows_8.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_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 5316 bytes
SHA-256: 8366b9dded3f0f6709538a1efd956c0911458c93a03124aa9b770b9260902136
font_01_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 11408 bytes
SHA-256: 77fe456ae01d11d2b970681b56dafd96b1155c3e06d744ee5ee36f397aa384d2

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