Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f86c0bb6d95af0…

MALICIOUS

PDF

83.1 KB Created: 2021-05-22 00:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5a80e4e4c93106cbc0df5a05e09ef01e SHA-1: 6bf6516b0ff19eb01d2477fc2e7be9cda490a81e SHA-256: 51f86c0bb6d95af0d46938de4b9906cc64c1706ed0b99f9d16941c2eb21f9b67
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, with a primary malicious URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful 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://mezovuduw.ru/strik?utm_term=unblocked+games+66+gun+mayhem+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375352/normal_6028696e191f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_6022651f82a16.pdfIn PDF document text
    • https://dujezokedibu.weebly.com/uploads/1/3/4/3/134392169/xujarukupevapog-zudesinovudot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5fe86a4293558.pdfIn PDF document text
    • https://wajiwojoduposop.weebly.com/uploads/1/3/1/3/131379590/1635610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_60527bbeecac7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1ec25a08-1cb5-46ec-bfff-1d79428ef6f9/apple_store_walt_whitman_mall_map.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/tazekunafuleg.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/zasafivisonoxixupijori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd344db6-119e-43b6-961b-05e2f3cb7d34/jikaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/42181337842.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/large_daisy_flower_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/truncate_excel_sheet_using_ssis.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/wopolokoxapajegeb.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/19736660148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5892d72-80ae-472e-bf94-4927b8b779c2/65862377118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d71ca6fe-2fbb-4da2-b356-dd95f0119920/dekodalotobivepatidova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e120737-2952-420e-bf6d-4094a677907f/topog.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/sight_word_writing_worksheets_for_kindergarten.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 5596 bytes
SHA-256: ad44806157185213a24e7ddc637deaef0de0984a40477fdcaf7c6a9c8b7d14a9
font_01_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 10924 bytes
SHA-256: 5b7dfc77dfa0582979d635cccaa516d819a63fa7b1e554f6d7225665ed3c64d3
font_02_sfnt_off000130fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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