Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae404ddfb983a250…

MALICIOUS

PDF

69.9 KB Created: 2020-11-13 20:35:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 781fa877fe582f884932b579e7ad5391 SHA-1: 9b9bc2dc23716bcfe2eab839603834f63c843d44 SHA-256: ae404ddfb983a250c438bfa993bf8afd33abe868de75870e99019e2bb24fef16
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a large link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffset.ru/aws?utm_term=vichara+punjabi+song PDF link annotation
    • https://devuzagobeli.weebly.com/uploads/1/3/4/4/134431767/fokomod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f98cd81bc574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5f8c97e1e8f68.pdfIn PDF document text
    • https://ligexomapaku.weebly.com/uploads/1/3/4/3/134321337/moradeferewupuv_juzebov_zalevewexafepep_belija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_5fa47d24636f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5f8bffa5d69f0.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/forupokisip/sufekezaraveb.pdfIn PDF document text
    • https://s3.amazonaws.com/gonuxiwela/31282293205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d8a6bfc-202a-4992-b237-f21f6fed3a02/celebrity_name_game_board_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c9833c-080b-4d3d-9b20-1367fbe37eb2/88667554149.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/mupifupuzetidubiza.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/81510051258.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_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 5344 bytes
SHA-256: 316533785c5de1e0695145284cf3d2f6f892d04d8163f93a7a3c24b64a3b00c1
font_01_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 11196 bytes
SHA-256: ea06011f9aa6a22106efc809ec1e195174f6d7bbb79ecd31133549c515b2a13f

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