Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e4addaf42fd054…

MALICIOUS

PDF

74.3 KB Created: 2021-01-03 23:03:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5803e4ee4507de11221fad539424d127 SHA-1: 2079e6253c2a855891ce7cce7d093b0fca8a0684 SHA-256: 88e4addaf42fd054e05cf4928f35a7fc3b5a8413c95e11842416dd045a6d344c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or redirection scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to manipulate search engine results or direct users to potentially 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
  • 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://traffset.ru/123?utm_term=how+to+get+dog+poop+out+of+carpet+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481164/normal_5fd99a914e356.pdfIn PDF document text
    • https://cdn.sqhk.co/daboxazile/N3igpOl/79158035572.pdfIn PDF document text
    • https://nozagovedenide.weebly.com/uploads/1/3/2/6/132682533/6109062.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/geIihia/superhex._io_hexar._io_io_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_5fdb342a5482f.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/1374d2d9-4e34-4632-bab2-d0ad0232bf23/wow_bfa_8.2_rep_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/cute_butterfly_emoji_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aaabb39-f02a-417d-a6b5-f28405989235/brake_wear_indicator_mercedes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c853c2-0151-4951-8746-a516189373d2/fevuniguzisituj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc11e702-84df-45bf-8162-03628d186151/toledo_blade_obits_last_week.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdcd62f-b3b6-40c6-b045-6871e4846b8b/love_and_will_rollo_may.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d8272b-8e18-4cf5-b44a-a9d8ea3aba29/lidurufupiwemir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a6bdd3-7de2-49b3-aee4-916df5fccd7b/zero_no_tsukaima_mega.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_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 5228 bytes
SHA-256: 0262a3b6269391e7bfdb41df4b7a7a88636d66a4f09cbf3d9d9570309d204e51
font_01_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 10180 bytes
SHA-256: a2a57ae2f15ff626e036ac3a363a98ab8ded4709a6ce1b4db97c4bd9e96749ef

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