Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d9f2389e7e7aee…

MALICIOUS

PDF

74.7 KB Created: 2020-12-26 21:35:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 64101ce7490bb74f2ddd67d2e941e045 SHA-1: b1feb18eaf832a067e7d9d0d401f140ae441bd84 SHA-256: 81d9f2389e7e7aee14c2a8fccabbc078f29c7bb0ad68070cf9d9f834e0cb8679
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically leading to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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://traffking.ru/strik?utm_term=highway+rider+extreme+game+online In PDF document text
    • https://cdn.sqhk.co/vekudaselux/q1jjgjT/cool_video_game_iphone_wallpapers.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/bcb576e4.pdfIn PDF document text
    • https://cdn.sqhk.co/gatutojuse/Pgexcql/online_gambling_slots_strategy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/bebixagajedamolibuwukafu.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/theme_worksheet_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/human_physiology_book_cc_chatterjee.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/personal_finance_balance_sheet_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/38338700873.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/wafedote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd251b6b-0c67-49c5-81e1-39469bec048c/39489113178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697da69d-f512-49e9-a89a-555c9f1c03c6/the_vampire_diaries_the_hunters_dest.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/beletupi.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_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 5284 bytes
SHA-256: 4cf65d856b5c59a22ce6b284ca0459500605ea6b6c17187d81148dc017f43ec4
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 9900 bytes
SHA-256: 895238e767e670828f0ffb3f8fc10091bc882e71a825e6e58ca404d8b3cdfad4

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