Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a64c7ffda93e8c…

MALICIOUS

PDF

75.5 KB Created: 2020-12-29 21:27:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ffd68c58f1773717090e9692b75564b6 SHA-1: 2f9d963d2620304d37230a3c9d80b20b19334f49 SHA-256: 23a64c7ffda93e8c6a1c507e4ba29026408e801772cf2bdf5a0bb144d6cd47d1
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious content farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ggtraff.ru/strik?utm_term=life+simulator+3+codes+october+2020 In PDF document text
    • https://cdn.sqhk.co/zowesifona/jiU7igT/hack_de_block_strike_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/VYSSsN9/46501592421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_5faf462a1a179.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/gFmRhhl/pinudikejivudilowosisuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/xolizoxime/TRhd8gc/i_wish_you_will_love_me_quotes.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/julolasunodu.pdfIn PDF document text
    • https://cdn.sqhk.co/zubixola/fcge2ge/nidilijigixobi.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxefoxo/f3bhjhd/find_my_friends_iphone_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445737/normal_5f9d354693bde.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/fajeloninesitel/aarakshan_movie_video.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/adjectives_exercises_for_class_5.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/hanceville_high_school_band.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/2020_full_movies_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/fitinewijexek.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/hiring_manager_intake_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/pipulasolekifuwati.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 8976 bytes
SHA-256: 6e133c41438bc4819b22d44e41f9a260cf109eb42a9074b94292d3b5dbe2ee57
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 5688 bytes
SHA-256: 6add044c99dc5945ff5c53a31e40fb7cf59fb47039b7d66a6ddf311f423c441e
font_02_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 10568 bytes
SHA-256: 8b009f3e2e7710f31fd12230e792569bd0295628e46320403d53d1c92d1be041

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