Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bd62749e17b372…

MALICIOUS

PDF

74.5 KB Created: 2021-01-13 22:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 94ffc5a67810c658ff66476e6641af31 SHA-1: b47a03e0f21289ca91fcd9fe84e67c9743e5a043 SHA-256: 36bd62749e17b3724b997ab97eacc375729bfe46251c714e1be9d8fb7e2691a3
156 Risk Score

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://trafffe.ru/123?utm_term=senor+don+gato+book PDF link annotation
    • https://fekanefitogi.weebly.com/uploads/1/3/4/3/134340372/42ad372b18e8d.pdfIn PDF document text
    • https://jewojumafolu.weebly.com/uploads/1/3/4/6/134651010/jerunadeba.pdfIn PDF document text
    • https://jiwujidevidu.weebly.com/uploads/1/3/0/8/130874067/26ffba947f298.pdfIn PDF document text
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/26327f58002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jifedefujodu/70594243831.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/google_keyboard_themes.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/39292130845.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/zuzujedumekajasasorim.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/xebikupivewugudodufolo.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/62567151372.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/73453028482.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/xufiki.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/data_structures_and_algorithms_udemy_free.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/caltrans_highway_design_manual_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/class_c_amplifier_design.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 4828 bytes
SHA-256: 821418b816ea142023075e1589e7f43f5a866e132f49d3e96c51f411dda1a586
font_01_sfnt_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 10784 bytes
SHA-256: e56f40dc66b06995a4c2490a2ef10e23e4e1ad8f6ba6865132e1b696be6b8b3b
font_02_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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