Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a662c1f341a685…

MALICIOUS

PDF

78.1 KB Created: 2021-04-15 07:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 24556f877bb75d9078a59a6a17896c07 SHA-1: 5fef17d44b4104ee0acfb59cd917913263b94d9b SHA-256: f7a662c1f341a685295c46dffa1a66e2fc4235662e38bdaa2fad0f891f4dce38
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://dafemum.ru/strik?utm_term=student+registration+form+in+html+with+css+github PDF link annotation
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/d9e4727.pdfIn PDF document text
    • http://xokijaxano.medianewsonline.com/didaf.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/photoshop_for_beginners_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481518/normal_600746a46b675.pdfIn PDF document text
    • https://zagiwesojuju.weebly.com/uploads/1/3/2/7/132712322/3503488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_6036fc8c7f031.pdfIn PDF document text
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/8778089.pdfIn PDF document text
    • https://gipenozup.weebly.com/uploads/1/3/1/0/131070487/2061557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_601456e35bade.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/architectural_company_profile_sample.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471948/normal_600b1c9b55d73.pdfIn PDF document text
    • https://doxezudira.weebly.com/uploads/1/3/0/7/130739714/nofadasavuje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kitilogokufalu.atwebpages.com/wivavuxagabujitapitumiwoj.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/danadunulukiz.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/magicseaweed_newquay_fistral_north_surf_report.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/troy_bilt_2410_snowblower_spark_plug.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/dipelik.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/66512778210.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/94138587410.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/lanolivibulewi.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/23375750439.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_f2bca80fb30447eb904a0bbee469a64c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/92729734565.pdfIn PDF document text
    • http://runuwug.myartsonline.com/biomaterials_science_ratner_3rd.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_ad47d3d892ab483998fb6cf2d502b356.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_90a537f8e3c24da6bf9be3f9e30f869f.pdf?index=trueIn PDF document text
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_91c8c395e1f545c7b0c7558808835fe9.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_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 5772 bytes
SHA-256: 16421ce36f7ef0be04ce92ba80461579fd9ddfc3970e7d6f6e4377042e7ee5e5
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 11020 bytes
SHA-256: 287b8a12ea4024c4570a8c2ec3a8f928d3cfb98e47270e29ad5fc19c56f44d65

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