Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bc2ef2c15d0ba6…

MALICIOUS

PDF

85.6 KB Created: 2021-04-14 10:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b248347c4f8cc2c466b91d16890a100c SHA-1: 59f58af28cfe57c38ebc4820db2778d80f8c1975 SHA-256: 10bc2ef2c15d0ba6c3e40cb5e4fc4f075badf8ed6df292e3bf44d01a9a64d998
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'nclex results california 2018', likely a lure to encourage clicks on the embedded URLs. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mezovuduw.ru/strik?utm_term=nclex+results+california+2018 PDF link annotation
    • https://pulolated.weebly.com/uploads/1/3/0/7/130740140/fd7f512.pdfIn PDF document text
    • https://baxuzenaxifo.weebly.com/uploads/1/3/2/6/132681834/kuxusuzudi.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/lexitafonoj_pifik.pdfIn PDF document text
    • http://zumepelilebatu.22web.org/trx_beginner_workout_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_6051a4a896215.pdfIn PDF document text
    • https://pexivepod.weebly.com/uploads/1/3/5/3/135346377/nagipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_601bf988b8a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_6020f8c322c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410207/normal_60249d41188d4.pdfIn PDF document text
    • http://hookup157.fun/stihl_019t_parts_diagramrlb1g.pdfIn PDF document text
    • http://bimoxalobabi.iblogger.org/simawubozakudokilejokubo.pdfIn PDF document text
    • http://mamajan.space/vuvazxahp1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_605f571a760b5.pdfIn PDF document text
    • http://vukosodo.iblogger.org/ejercicio_92_pagina_151_algebra_de_baldor.pdfIn PDF document text
    • https://mizujaketoki.weebly.com/uploads/1/3/0/7/130776151/1fec62e381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejabogakulidit.epizy.com/xeguxibufipovave.pdfIn PDF document text
    • http://fobupozomorefiw.epizy.com/32943965360.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/59732279841.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/lunutebe.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/dufipofurup.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/77090567801.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_5228628d057343988106fd0d40c9cf8e.pdf?index=trueIn PDF document text
    • https://9aef9be9-4304-4ec6-b02b-ded1eabc5d1b.filesusr.com/ugd/a571b8_f0ecb2367ea1465fb1f799c3045a110c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rufonali/45243779306.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 5432 bytes
SHA-256: 7209b8bada1934b5433721b9d722a0e86f09fa69e45a763b437182d22bcf1803
font_01_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 12228 bytes
SHA-256: 69e2ad7d2f3ffdcd59726dc5a0738fc6364b6ae3350710a5baf696792de08f10
font_02_sfnt_off000133b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B4 16084 bytes
SHA-256: bafb214dce55e82c115a9406e49c590f75cc980f3b24d983169273df1bf98dd7

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