Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e73558417d65ffe…

MALICIOUS

PDF

70.4 KB Created: 2021-06-09 07:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f6893c4b0f832c054bd15bdc62eb5a6e SHA-1: 21210e5918774f08774f6c6555e3a995d547ac93 SHA-256: 2e73558417d65ffe95a2b48b875a9332ea2d489294c0cdaf8aff9af6a9e676ec
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/pbw?utm_term=ielts+bar+chart+band+9 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388825/normal_5fe51c29ea0fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_604acbe87fd9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445871/normal_600868af9eb46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393638/normal_5fddfca370828.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/mewunilezoliboraxufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_6003be0ae674a.pdfIn PDF document text
    • https://fabofosozani.weebly.com/uploads/1/3/4/8/134870462/61c353037340311.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/2c898b4e-d3a4-4da5-b953-14ea4f01885c/pukiduzezexages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18447eb9-af6c-4a9b-81cc-e5a269b9c53b/canon_rebel_xs_d1000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fefa65b-7393-476d-b802-8571a1229198/vubujasoparupufiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e61853-68f7-4143-9378-96c53cb59e6d/how_to_use_sunbeam_electric_blanket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53976893-8228-4730-88f8-6ca4f0735ad2/dirt_devil_power_stick_lite_4-in-1_corded_stick_vacuum_sd22030_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672b5089-241d-437f-bcf8-5fb9e140592d/what_was_the_final_vote_on_the_affordable_care_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8da2e6-6fb1-4f29-a43b-5d0613680225/41544001500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d7943cb-3b54-4ec5-80a5-974cfd0f6249/student_exploration_nuclear_decay_answer_key_activity_a_continued.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2d4e14-f6c7-4de5-84a6-f45fab48d2f2/sbi_clerk_mains_exam_analysis_gk_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf45ba44-b81c-4a31-9d5d-49c96dd2c193/33401521167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5570717-eec2-4739-9e68-a8b4a894b2f5/starting_new_life_love_quotes.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_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 5260 bytes
SHA-256: 49366cfd52b3ccf4bd4bb581f82f86d74bc30e5c91bd78271c7819826f1e1f5b
font_01_sfnt_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 10592 bytes
SHA-256: 71043195afc83b142699075e738a6d443a8780ab40700dc6a9fc8129ef3abf0c

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