Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f61b84f7d94aae6…

MALICIOUS

PDF

61.7 KB Created: 2020-12-27 20:16:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6c1fdfc89c69eb4b2c79b396d00f8715 SHA-1: 2b2441d560c23288a15aee2fd9a098f18f631434 SHA-256: 5f61b84f7d94aae6a1ecde077c61398ee07268586dfc23310b417f7eccd488b4
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, many of which point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature. The primary URL, 'https://traffking.ru/aws?utm_term=factoring+perfect+square+trinomials+worksheet+doc', suggests a lure to a website disguised as educational material, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=factoring+perfect+square+trinomials+worksheet+doc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5fd7c293d3ccc.pdfIn PDF document text
    • https://cdn.sqhk.co/dovutiwabule/9ihihhd/titoretukenovogenozekeka.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/hg8lJ8Z/zipuxajog.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/TMphcie/migebozekiwar.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/iGkBHhi/boba_milk_tea_recipe_from_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/Yggunha/tag_with_ryan_combo_panda_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5f9b16b94285f.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/5616165.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/crafting_dead_somerset_map.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/pikalimenobemodunowenaniv.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/jixarujejezabite.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/simile_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/potixetizuzapaker.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/biased_and_unbiased_samples_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/najegebokofiwuwevagu.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_off0000b546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB546 5808 bytes
SHA-256: 7d7e48ba3bb0cb752f69a95d0fde3c7a71885261204c47d12947eb62cb608d6d
font_01_sfnt_off0000c8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EB 9680 bytes
SHA-256: 830020448cd4080e34d7b317539c29e4ace94cc8d57b4b7f0e7944ce711cc1a1

Open this report in the interactive analyzer, or submit your own file for analysis.