Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f32890cd54032e4…

MALICIOUS

PDF

70.6 KB Created: 2020-11-23 02:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 87921d38539387a52814a071b2735c9d SHA-1: b52c73767fd8b144508574742099a23b489b8fee SHA-256: 4f32890cd54032e4e463e9973eae21b54946eea989661a81e9831e8afc186d5a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the PDF suggest it's designed to redirect users to potentially harmful sites, possibly as part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=find+duplicates+in+google+sheets+column PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413369/normal_5fad2453a3219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_5f95c7abb9a8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_5fb7edf0d7c3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_5f974cc783269.pdfIn PDF document text
    • https://tuzuwopibas.weebly.com/uploads/1/3/4/3/134316447/puruzatizeli_wewozexut_rogameledemoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_5fad4a49284bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_5f9eefe124594.pdfIn PDF document text
    • https://janokapaw.weebly.com/uploads/1/3/4/3/134329878/4de99b9a14516.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/9227c3c4-e26f-4478-96bd-b515997ae1d2/antenna_and_wave_propagation_basics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/009e9cae-4e7c-4eea-84f1-f10d3a5097c6/best_portable_chargers.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/12179250072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09acab2-4771-4fcd-9d13-dc92f50a07c9/56057633132.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/life_of_pi_island_symbolism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a599e452-a6bc-45b0-940e-5270c8ca71dd/molito.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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 5344 bytes
SHA-256: feee42e2f44fe4cdf6bdf2a1c05038b9a3540ae8f391295090f3303b62d680a0
font_01_sfnt_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 10752 bytes
SHA-256: ad49872a21326df6bb224251b281388b1bacaec2c139e143ee724d7bc4a74bda

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