Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d9517f5c5cbf00…

MALICIOUS

PDF

77.4 KB Created: 2021-02-26 01:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e974bf21e02f861f218ab3b315a7e328 SHA-1: ba9553a036acfb8e959c42303c93a6683d30f663 SHA-256: d7d9517f5c5cbf00f2326cf955c937dd7d813b8aabe3003715507f57589d3d8f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to benign-looking documents, but one primary URL (https://druttle.ru/wb?keyword=manuale%20sigma%201609%20sts%20pdf) is suspicious and likely part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to redirect users to potentially harmful websites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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/wb?keyword=manuale%20sigma%201609%20sts%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451220/normal_600a521bddbba.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/6872f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454162/normal_60370c2f2456f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379984/normal_5fccebaec56b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_5fe70285a791b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_603273294dd1d.pdfIn PDF document text
    • https://jokiwaxe.weebly.com/uploads/1/3/2/7/132740814/1fbfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_60181aa99aabf.pdfIn PDF document text
    • https://jupolojujilozas.weebly.com/uploads/1/3/4/5/134598947/e6c4a30e0b721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5fe9fef04a3f9.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/petikamov/early_childhood_education_curriculum.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/boss_rc-_30_manual_english.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/40521744993.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/81565348918.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/96947511487.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/alif_laila_bangla_all_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/zapesokedepopebo.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/39521806276.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/react_axios_binary_file.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/midaxoduwugalogoto.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/2005_cts_v_transmission_removal.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_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 5776 bytes
SHA-256: 942b308500aec4864092a50b2ec5f1ee1c9f7b1fc0df6b4ff3e19f0a515257cf
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 12136 bytes
SHA-256: 74b46dc268edd73f2805def0dde509fdbe91fe8e1478d620b3012690c6ef7f9b

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