Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04309d20e6d8462…

MALICIOUS

PDF

88.4 KB Created: 2020-12-27 20:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b5c5ee538f431f9da462df81f60c351e SHA-1: b927cb255281142fcbe20ba2604c257078626c0d SHA-256: f04309d20e6d84629986c54bdd73ccc630f5cce4c8b853c36f01616a88f33a55
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating it links to known malicious redirector infrastructure and a PDF link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of numerous suspicious URLs points to an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cctraff.ru/aws?utm_term=sinhala+baby+songs+mp4+free In PDF document text
    • https://cdn.sqhk.co/sejujona/ficHY8s/turbo_stars_game_download_for_pc.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/f26382ce38bd1.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/hfigdjj/bejuvezatajejewotasani.pdfIn PDF document text
    • https://cdn.sqhk.co/bidomutarili/gjjiAQj/the_rules_of_survival_book_review.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/c93fe83f-3d30-4321-954e-46221f5686e2/17022994833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360d0502-a104-44c9-a262-cba0a037b34c/9474153989.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/honor_band_4_running_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8949c41a-9db9-436b-b1bc-fa87918f9fa8/beowulf_crossword_1_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/7704094346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9446c206-0c25-49d8-9839-c3059f3d45d3/hello_sharechat_video_punjabi.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
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 5748 bytes
SHA-256: bc07c74553f87af70554b18c1d1fed50885169d796df9418630848d9140d586e
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 21728 bytes
SHA-256: 334765fbde08ff7a1fddb53dd6bfbdefd77f69b1c84b4a90c308deb0066f382d
font_02_sfnt_off000118a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 11264 bytes
SHA-256: 30b5cde8e72b109f33b1092f77ae2c2586582f225ed4074d6586b83bea7f6c56
font_03_sfnt_off00013e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 16064 bytes
SHA-256: 8e42d56dae80485ab44b605faf929d3090604e41aaa333555e3e2405fe999d95

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