Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de263fc7e6fdb03…

MALICIOUS

PDF

69.4 KB Created: 2021-02-20 01:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6b526b4721628ccd41cb7bc071672c01 SHA-1: 18764e930ae45d7e8d3b0087761323428294c7e0 SHA-256: 4de263fc7e6fdb0360c340a1ce90bd1c424834f2dc8f0d5b5377dc92e0596cd3
164 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to a large number of PDFs. The document body, though heavily obfuscated, contains text related to 'how to become a life model for artists', which, combined with the invoice lure heuristic, suggests a phishing or scam pretext. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document is designed to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/wb?keyword=how%20to%20become%20a%20life%20model%20for%20artists PDF link annotation
    • http://igcopyrightforhelps.com/cooking_and_fishing_guide_1-_375_hordek2w1z.pdfIn PDF document text
    • http://shoop-fe.ru/26998318015cmg2o.pdfIn PDF document text
    • http://particulieres-societegenerale.best/buku_bambang_noorsenajnhdj.pdfIn PDF document text
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/xinojobisuzel-xugasetuwoge-gaxafoxifesevu.pdfIn PDF document text
    • https://remezovegaz.weebly.com/uploads/1/3/1/4/131406605/6846843.pdfIn PDF document text
    • http://dalnoboyi.xyz/45067281152j9n95.pdfIn PDF document text
    • https://sedawuxel.weebly.com/uploads/1/3/5/3/135326539/mazejaguja.pdfIn PDF document text
    • http://clipshd.design/math_worksheets_addition_and_subtraction_first_grademjbbm.pdfIn PDF document text
    • http://smartcreditcheck.info/95677547245j7aer.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/wunojipu/56441143151.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/nujegagugilizifibigo.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/fenirepelafetananobad.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/wopofopitonuvatozodamul.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/why_is_the_half_life_of_iodine_131_important.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/canyon_camera_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/bujokokanafolojorazokuj.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_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 5360 bytes
SHA-256: 18d4b849df4f8b25b5251f971feda0dd67814ba9edd77ff185b40fa028001bc8
font_01_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 10204 bytes
SHA-256: a93dfbfa41e38517aab488988a60bc25b7a041cc4013e2af29d65d9f47cb5170

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