Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51485e91ca82d22…

MALICIOUS

PDF

68.6 KB Created: 2020-12-25 10:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 20aa24ab79da4a6812d07dfe3aa26356 SHA-1: a2bff0dc0fd47c253d61dd893b34738049a908f3 SHA-256: f51485e91ca82d22602afe6f391fb0c754feec758a9e4a74bafdf436e5c54bfe
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, characteristic of SEO spam or phishing. The embedded URLs and the document body, though heavily obfuscated, suggest a lure related to game codes. The presence of external links and the overall structure point towards an attempt to redirect users to malicious or spam 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://trafffi.ru/wb?keyword=power%20rangers%20legacy%20wars%20codes%20list%202019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5f937848ccdf3.pdfIn PDF document text
    • https://dowamiwimeguv.weebly.com/uploads/1/3/0/7/130775936/3244982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_5fa617a348f15.pdfIn PDF document text
    • https://tonurokekar.weebly.com/uploads/1/3/4/4/134456200/4935443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490920/normal_5fc541e00ebe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fd225a0a18fa.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/9a15f5a0-899d-450a-87c7-f0b8ac2ac6f3/80064478591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a6aa5c-ba68-471f-83fb-d8c6767e373c/fashion_place_mall_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5e7e6f-48b3-46b6-b16f-31383ae748ae/kurometasadasawalume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfec0490-6ec3-404a-83c5-3e540bbf0a54/how_to_make_orange_dye_in_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b42c0c5-6cf9-455b-8732-cbfff91cd7e8/cello_playing_for_music_lovers_a_sel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29cc7ad2-c4e8-434c-8db8-fdfadcf9cd83/4497175376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd0e825-a7f3-49fa-a1de-4fc58d07c18b/32892227298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9760d02a-2d9b-4951-8301-ed3b65893888/god_s_providence_definition.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_off0000cd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 5784 bytes
SHA-256: 484ab771bf10d9ee3dc78c33ffe01c840371d91bf1d36c0b9eb0b11f6a67a8e7
font_01_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 10720 bytes
SHA-256: eb87db1aec1e7f8e2f2ee83bbd01a766918f3c338634ba515244639138d140a2

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