Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e70b3c959e233e…

MALICIOUS

PDF

82.1 KB Created: 2020-12-30 10:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 828c45bdd5b850c58280ec3cec9bb5b1 SHA-1: e5d0efc250cb770b2f1c2b5db63de3f81a4ccb0d SHA-256: 49e70b3c959e233e1729833d343b2b7889b0d1dec967d89085e5d1048d3ba5c4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, with one prominent example being 'https://cdn.sqhk.co/fedelubu/ggiinJM/48257133600.pdf'. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further supports its malicious nature. The document body, though heavily obfuscated, contains text related to 'Domain model class diagram online' and 'wkhtmltopdf', suggesting a lure.

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
  • 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=domain+model+class+diagram+online PDF link annotation
    • https://cdn.sqhk.co/fedelubu/ggiinJM/48257133600.pdfIn PDF document text
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/6843013.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/widef-xilajuzet-wisogafit.pdfIn PDF document text
    • https://juzumefewuw.weebly.com/uploads/1/3/4/7/134766708/87662.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/fejire_xuvabimuzaxi_kukij_joterunixukemer.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/hjcH8if/15429951934.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://uploads.strikinglycdn.com/files/310f4ad8-4546-47bd-8aa7-a67b5ba351ff/ronebanudenokejetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c125cf52-ee0f-484e-b9c0-cd9cef40c546/el_sur_jorge_luis_borges_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/bhoothnath_samay_ka_pahiya_song_pagalworld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee47ea89-f262-450e-9d38-5a3054c10b58/passing_by_langston_hughes_theme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfbc2565-9442-4fbc-9572-6596581b5caf/96503324479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efbe7c0-e19f-427e-a6c1-1fa8f38560b2/dell_inspiron_17_5000_series_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c905a0-5ddc-4e91-82e2-3af2597ed2c4/bissell_lift_off_deep_cleaner.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/51919567453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d297e3-c456-45eb-9443-5712d739ccdd/tuzatuxuriwetisapefoluda.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 3684 bytes
SHA-256: 25711b8cefef3cebf6568d7d9e749f30a22f7a30548ceb01300d566fd8f8c12a
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 4964 bytes
SHA-256: 0f2963882faaa2a0d464f50f14f75ab0ce1210824120152c2fac4e76d8d95b08
font_02_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 10592 bytes
SHA-256: cfd6a098d2c3726319b1e7c63b4dbde7957faa8e7f8d1c9452255d4558c1a147
font_03_sfnt_off00012cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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