Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa54cfcf602ce16…

MALICIOUS

PDF

104.5 KB Created: 2021-03-18 14:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc74dcfd32f79c35d82dfe49e5b0cedf SHA-1: c960c4777aba2c55f0bc5cd34cf6e5f5d09e03ba SHA-256: afa54cfcf602ce16c609537a7d1eb319ca3e930a96e3e18f053c8cb9ca992c15
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous external URIs, with a primary one pointing to 'https://dugedepap.ru/123?utm_term=angry+birds+games+for+android+free', suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains text related to search terms, reinforcing the lure. No scripts were extracted, but the PDF structure and embedded URIs are sufficient to infer a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/123?utm_term=angry+birds+games+for+android+free PDF link annotation
    • http://goodsun.fun/25194078547agj9z.pdfIn PDF document text
    • http://copyrighthelpcentral.com/20463955839wq4jq.pdfIn PDF document text
    • http://zinekob.66ghz.com/recursive_functions_in_python.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_6041125549d12.pdfIn PDF document text
    • http://pogadai.xyz/real_book_6_edition_download4t0kj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_60168d24d0b30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pogebikaku.epizy.com/how_to_turn_off_alarm_on_timex_indiglo_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/93542813432.pdfIn PDF document text
    • http://lekazukexofa.rf.gd/63572802344.pdfIn PDF document text
    • http://kusefiselarezex.epizy.com/tajez.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/zusosimelekefajimuvo.pdfIn PDF document text
    • http://zilisugifep.epizy.com/matlab_plot3_color_gradient.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f35dcd-5f2b-47b6-9818-96e7cece6a62/skyrim_glass_greatsword_location.pdfIn PDF document text
    • http://bumumewevebav.epizy.com/carl_jung_red_book_synopsis.pdfIn PDF document text
    • http://pidukegub.epizy.com/holmes_air_filters_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf885ed-06d1-4edf-95b6-e511f037af6b/best_scroll_saw_to_buy_uk.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_off000159f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F1 5424 bytes
SHA-256: cacd6a67dc53d208f6ec42282aab98bc82515af4d9e42461a29ab580b8cd8d05
font_01_sfnt_off00016c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C58 12160 bytes
SHA-256: 9670ea75e9bed38b10abf1880f5dd77584e65a88978d92042e775faeaf7eff42

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