Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb40174ab7b26275…

MALICIOUS

PDF

70.4 KB Created: 2020-12-27 20:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e2591a05031eaa0b099cf1a9578649a1 SHA-1: 810949b885dad70df9249b0804209b4ad4c2fd46 SHA-256: fb40174ab7b26275ffafb2ce36c6a7c06696281a2f37840c3d9afc24eaa3bc4f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirectors and link farms, indicating a phishing or malicious redirection attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest this. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification point towards a malicious intent to redirect users to harmful content.

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
  • 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://cctraff.ru/strik?utm_term=safe+zone+in+free+fire In PDF document text
    • https://cdn.sqhk.co/pewovixosafu/cF5icfi/one_good_turn_deserves_another_proverb_story.pdfIn PDF document text
    • https://nefupoxuwuridek.weebly.com/uploads/1/3/4/7/134747690/8047725.pdfIn PDF document text
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/jifubin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f9a5bb91e8cc.pdfIn PDF document text
    • https://cdn.sqhk.co/bazopaxepifu/UQmYOij/derukijarufukibijow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fb672c36668b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_5fc89edd0eacc.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/b4df7d57-b36e-4080-9b02-c90e3c16561c/74836117820.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/zovuromuxaditelepaxep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e00c336-801c-495d-a7c6-a938dddf65d7/23603611879.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/30971442695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcec316f-0b77-45eb-8681-123326e99a2b/learn_hindi_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/candy_camera_apk_old.pdfIn PDF document text
    • https://s3.amazonaws.com/fizijosoraginu/coshocton_county_recorder_office.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21a8938-c08a-41cc-8616-40240a3abf39/41136560424.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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 4704 bytes
SHA-256: 8bb666036abfbcb1b9622e42a3bd2e876ea491ac394aa1b3aa8ffc8cf9659b16
font_01_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 12036 bytes
SHA-256: 15d92c71106dd696d066715ca682c799ec910e8ce90920d5ee872a8fd8bb60f6

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