Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff2c287855dbc04…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 14:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 66d43baa364d7798cbb6460ae334af6d SHA-1: 5f23cc4cab00914d2a0fc1905024ff290b99b2c1 SHA-256: 7ff2c287855dbc041a3ecbff243537cf19a728563c1548a0fb6d939a5e84a7bb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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.
  • 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.
  • 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://jottigo.ru/123?utm_term=veritas+chisel+sharpening+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501029/normal_5fd6795904571.pdfIn PDF document text
    • http://vafijevimam.iblogger.org/bhojpuri_song_mp4_pagalworld.pdfIn PDF document text
    • http://viewcreditscore.info/2008_jeep_wrangler_x_hardtop_for_salezkm6g.pdfIn PDF document text
    • https://nazigexasuv.weebly.com/uploads/1/3/6/0/136081917/duweto.pdfIn PDF document text
    • https://tomoniwibisuxis.weebly.com/uploads/1/3/5/9/135961627/nupisowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_5fd933ba17f85.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/f4549b7a0f72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479436/normal_5ff1815b09c2d.pdfIn PDF document text
    • https://jufufowepum.weebly.com/uploads/1/3/5/3/135348100/4937249.pdfIn PDF document text
    • http://biomaniks.website/big_maxx_80000_btu_manualxylme.pdfIn PDF document text
    • http://ledy66.net/adventures_of_huck_finn_summaryrzkyz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://risexogukif.rf.gd/zawasawu.pdfIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_afb3cbd7d2d646a4ad95d226b1a4132e.pdf?index=trueIn PDF document text
    • http://ladorum.epizy.com/90275837173.pdfIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_fbec7d63d95742f5b51e1f93e8258d6f.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_e79bc97b3c824470986fe6ba491f3550.pdf?index=trueIn PDF document text
    • http://peporil.rf.gd/6985135884.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_e901ee94e58643a4a6b9e579e1972860.pdf?index=trueIn 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_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 5300 bytes
SHA-256: cc4a2014d867f400d3868bb425253f43034c122fa77944f28cb9fd0c512bccea
font_01_sfnt_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 10540 bytes
SHA-256: 0e04a615192e8ba61a929af7ef303203b1011d81326413727bdae164f054fa22

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