Malicious PDF — malware analysis report

Static analysis result for SHA-256 3395e6a45aa375f3…

MALICIOUS

PDF

90.1 KB Created: 2021-03-16 11:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 85bbbc5a4655822a67767e57bcdbf8b4 SHA-1: 5b9adf62f37d75e8087587cfc97da07659734cbc SHA-256: 3395e6a45aa375f31b8fd324464c25e8488a091a006c3ec47fb2bb7f32d2d992
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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://xajibur.ru/strik?utm_term=pursuit+of+god+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502248/normal_601cc0e0181a4.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/depupopovesedu_surajixex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382781/normal_5fec37016e03f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418796/normal_5febdf08db65c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497075/normal_5fcd96904a19d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_601663ca251bf.pdfIn PDF document text
    • http://vududodudo.22web.org/giretubitobada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417814/normal_5ff8f4e495038.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/como_cambiar_de_a_word_en_mac.pdfIn PDF document text
    • http://bepevekebezupu.22web.org/58825520382.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/8699149.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/american_heart_association_diet.pdfIn PDF document text
    • http://vumavotanumibuv.iblogger.org/70433344030.pdfIn PDF document text
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/894fc495a7cb043.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_37908a6a653c4eef8817d1b5ae1f21c8.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_5e6f1451d2c7409e8280e3dd99ac8a51.pdf?index=trueIn PDF document text
    • http://nokafifebezazo.rf.gd/83524985591.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_627602d85781441ab01565fe8e35d5e6.pdf?index=trueIn PDF document text
    • https://f2182bdb-ca8e-4fe7-b379-f84e14eeb57e.filesusr.com/ugd/026bcc_3e0aad109ad34d0bb42e75d8ccf3d8a3.pdf?index=trueIn PDF document text
    • http://mexowotevofo.rf.gd/latest_american_film.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_d094cc7ce6db4d629bad3e7f314be603.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 4936 bytes
SHA-256: 6760bd2ea3af7e5b3c89d8ebf00d26e740e5134779a3a8cccec4d4f049a61607
font_01_sfnt_off00011f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F08 10792 bytes
SHA-256: 9d27a88509a1ffaa87fe54f453a453abaf69ba366b6554a795337f3ecada2a16
font_02_sfnt_off00014404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14404 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6

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