Malicious PDF — malware analysis report

Static analysis result for SHA-256 6581fed8289c8657…

MALICIOUS

PDF

72.6 KB Created: 2020-12-20 21:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cf50785bfea22c426f27829b283d01f2 SHA-1: e68eae09dd87d9314059f7624c5fa435b1f86c11 SHA-256: 6581fed8289c8657116c3a4d93c94a57d973142249752b361951084e2e130cb9
214 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high-confidence ML classification. The PDF contains a large number of embedded links, many pointing to external sites, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=pool+rules+scratch+on+break In PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/zoserugulazu.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/3417448.pdfIn PDF document text
    • https://kupukibofiwu.weebly.com/uploads/1/3/4/8/134862242/lobevejowej_bavopofesigewom_sumisidov_risil.pdfIn PDF document text
    • https://masagepa.weebly.com/uploads/1/3/4/0/134096256/xegofigesanifop_penuzexi_lebojozatir_papubaxor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5fb8a203d2864.pdfIn PDF document text
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/4004344.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/572672.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/168b8174-a934-45c3-b922-306f1bae3fb4/us_army_recipe_cards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa7db27-16b4-4137-920b-968c25c92034/hitch_spare_tire_carrier_swing.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/template_for_graphic_design_portfolio.pdfIn PDF document text
    • https://s3.amazonaws.com/mokavilez/my_hero_academia_dub_episode_39.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/99907591025.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/motavuzukejilosom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff99b59-6b37-4dfd-b473-fa76bad6fda6/giwoxidinegevegawa.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_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 5092 bytes
SHA-256: 61446b841c76abdf328325265593a28a773fd0596573a05afaa569a783239434
font_01_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 10288 bytes
SHA-256: b8f2bed970c5cba7b3de085c634b18e4c1742126efda482eec19e6c7ab1fccd8

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