Malicious PDF — malware analysis report

Static analysis result for SHA-256 b876c43596caa3ed…

MALICIOUS

PDF

94.9 KB Created: 2021-04-02 00:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 53ac76b44e53083491d30065f0f04fcb SHA-1: b07edf6b60da47fe1e9f8e2337453e33a8d0ae99 SHA-256: b876c43596caa3ed8c513e1603f4cb5276ea907ce48d0245fadc01797dfcad4a
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 0.9996

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://jumiwimov.ru/wix?keyword=5th+grade+quotes PDF link annotation
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/samiwasov.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/mebov.pdfIn PDF document text
    • https://ximafirufiwazi.weebly.com/uploads/1/3/4/7/134755441/dapazi-poguliluxafimu-kofujaluruze-tusinewodak.pdfIn PDF document text
    • http://bekasopeli.22web.org/oil_gas_company_analysis_upstream_midstream_and_downstream.pdfIn PDF document text
    • https://saxepuxuk.weebly.com/uploads/1/3/4/4/134472003/fa3438.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/5231b6.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/f2fe948.pdfIn PDF document text
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/403448342f9304c.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/bibikodomukixexefejarati.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/352f82f2-260c-4f4d-8814-ff81e08a482f/singer_futura_ce-100_troubleshooting.pdfIn PDF document text
    • http://zalinejogimi.rf.gd/89419354700.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/venice_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df22dc6e-ee00-496c-b224-5c186493c4b7/15526620339.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/73912651356.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/77639007727.pdfIn PDF document text
    • http://jovesupegomiz.epizy.com/pikojubikezupa.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/54513707160.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/96469320168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74643345-b176-44a0-b550-6b2a3eadc8fe/70697488609.pdfIn PDF document text
    • http://xufolat.atwebpages.com/79183653208.pdfIn PDF document text
    • http://dirodinuvuz.rf.gd/math_book_grade_7.pdfIn PDF document text
    • http://legabukev.epizy.com/can_i_study_english_and_work_in_canada.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_off0001385c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385C 5208 bytes
SHA-256: 2e6a299e521d6fd46ae2e45f7bcfabbf87f18efd64f34ac3bc7fc9de9b54004c
font_01_sfnt_off00014a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A00 10884 bytes
SHA-256: 7434e377f07d01eb73360aadd331148e7999b89f6e6c6969a5ada462e96ee870

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