Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd331f1fa6a30270…

MALICIOUS

PDF

61.0 KB Created: 2020-12-03 04:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 73dd966da7e4f755920876b6183250de SHA-1: 1b1f616d75c5d609a1236e44f5b7709fee10ae28 SHA-256: fd331f1fa6a3027019fa5484ce49bcdb2dca35967bcc8e3542d336a46bac0807
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/123?utm_term=mapa+de+pr+y+sus+pueblos In PDF document text
    • https://rugufixib.weebly.com/uploads/1/3/4/3/134381394/zesupolewu.pdfIn PDF document text
    • https://saniruguroxi.weebly.com/uploads/1/3/4/5/134585545/xikofe_rigejura_loxawimer_vekugimi.pdfIn PDF document text
    • https://motapesuna.weebly.com/uploads/1/3/4/7/134749044/5000164.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/9234d688-7724-47df-a732-b714bb7efcdc/thai_art_restaurant_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565ea66e-4a5c-4861-b25e-c50d41426b08/48903593852.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cf3a5e8e827d428d5c84/t/5fc581729ee0f32b870f7ce4/1606779250744/newton_rings_ppt.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27fb3239b0722913b63ef/t/5fc3b1659d79364840fe928f/1606660454533/27010046034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bcdf044-0990-46e0-9b1f-29eae24256aa/section_1.2_a_view_of_earth_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f4795d-68af-4a3b-b065-fdb97d2812ba/nuwa_hitchhiker_owners_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28d4a3398ff7515387b94/t/5fc4bf063c02f22b9da27c87/1606729479162/73398015642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/473966c2-e788-431c-9387-d2cde6052d78/basup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc054c59-d149-4069-b9bc-1f77aca5d14d/xijasilosep.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_off0000af6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6D 5200 bytes
SHA-256: e51239760bf0bd2f33eee2fffd74c2e70c68b634a3187a17d2b128f1ef423003
font_01_sfnt_off0000c133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC133 11264 bytes
SHA-256: a2c58ddbcdd0b2343b8f15d91b8eb456aaf68d162fea11b3f3d139ceacf11bf6

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