Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d952721518b12b…

MALICIOUS

PDF

84.3 KB Created: 2021-05-28 23:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e5928e09e5bcba50cabac47422006ac1 SHA-1: d36919997dac0cac4f07a2579fb71d31f595d8e5 SHA-256: 23d952721518b12b777f0af0d954d61cf1aefc4f977cbd438e5185e970251a76
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to 'dugedepap.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/123?utm_term=lollygag+crossword+answer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450733/normal_6049c0d0e6a15.pdfIn PDF document text
    • https://girusetobar.weebly.com/uploads/1/3/1/0/131071114/9822356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_6023bf0e3d0bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5fd77a5ee80f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_605a2fb3b7fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_604207e1df32f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459929/normal_5fc99e1a8addd.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/3708644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_605473827d6b9.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/b017d2f6ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_602185803f25e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463005/normal_5fe8ed6366f40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5fc89835948f1.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/a54721891a4.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/4904bb1f-1c39-4a97-98e6-214d74df93f6/tekezapedibigenomilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9808a5b-73ed-4ce3-b36f-10de8e5ffe66/21023996336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd7d103-7fd0-425a-853d-08cd1fd8a10d/19499040247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4508b45-730e-4eb0-82f8-54d3245c1849/tips_for_stopping_binging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38a3062-5c19-4fa0-9838-2023238cb884/molecular_and_cellular_biology_impact_factor_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93511dd-c40e-4420-8ff2-170e2b8bb4cb/xbox_one_controller_usb_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edcc7f85-f254-4a4f-81bb-25b3c3bee4eb/crossfit_training_with_dumbbells.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded4d7be-a7d6-48e5-983f-1e43ec132c0d/fonutopebimagefolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500373e6-ee80-407d-82fa-70f8e30f859e/fewewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c985f94-b1fe-47e5-b5f8-acb3eccadd51/xuniwuxom.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_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 5240 bytes
SHA-256: 88f50c134e84685f04bb6ad3486e0f2d3cdf3db9ce1e26a7ea85fe0ee827ad4d
font_01_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 11180 bytes
SHA-256: 693d7b92c5d28e2da4e464e0b13df7e386e8e508b2222ad7223cdfa343328c8b

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