Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae555a21b68bd712…

MALICIOUS

PDF

67.7 KB Created: 2020-11-10 23:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3922c667b5c7b78566e428ab698dc077 SHA-1: 105575fbdcb9daa7df5e50cadbb1514da43162fa SHA-256: ae555a21b68bd71214660d0f655fc97dc3c7b145fcfd4210a4450d7722fc56e8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=legalism+religion+symbol PDF link annotation
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/jemunugejogod-vaber-tolujo.pdfIn PDF document text
    • https://xojujafu.weebly.com/uploads/1/3/4/6/134633902/2432745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_5f96039e5aaae.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/8dbd7182-5481-488c-967f-afb1bbb95971/term_meaning_pertaining_to_the_skin_med_term.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf809e6-f023-4e70-a874-9551418baae6/nilipubonufitarejawalutub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a05b0ab-a084-40a3-a5d0-db4731ffc0c6/download_minions_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/famew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6a2d1e-8143-47e4-bd3b-b0db26551be3/how_rich_is_lou_diamond_phillips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc8dfca-7dfb-4286-953e-9c3e03a4ec77/ouvrir_avec_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad8d50d-37a2-4069-b3de-fb23f3cb011a/nevada_straight_medicaid_provider_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebce16c-a754-41ec-9c48-28e9545709a8/total_consecration_to_mary.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/vibususubanosisijitudeba.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/grim_dawn_leveling_guide_2019.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_off0000cea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA2 5188 bytes
SHA-256: b9b41f821f595edb5a16c8b5eebaa9c49fa38d4e9f21711d7ade1c54075661be
font_01_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 10092 bytes
SHA-256: a4def1f9dc6ec8f2141def337dbd6bd9c20a78a43c8ad901c6efa72a1703e27f

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