Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5ac5690deeca3a…

MALICIOUS

PDF

79.4 KB Created: 2021-03-18 13:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 523a52d4c13f6629d3bedf940f6aa949 SHA-1: f1cbadfa4090c038d7bf8c903a69c8b8f98c0130 SHA-256: cb5ac5690deeca3a829e1776ef50cf7f036dfaee22714a4feed65b33368c672d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 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://midufefew.ru/aws?utm_term=how+to+disassemble+sole+e35+elliptical PDF link annotation
    • http://speak4pro.com/taming_of_the_shrew_act_2_scene_1_scripth11c9.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/nJXiagj/battery_twinkle_lights_with_timer.pdfIn PDF document text
    • http://dkshlyap.ru/45857588023pt1ig.pdfIn PDF document text
    • http://lnstagramcentre.net/sometimes_you_just_cant_win_quotesyb5mp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_601098d4e0b32.pdfIn PDF document text
    • http://deine-gabe.com/94080309227o7570.pdfIn PDF document text
    • https://cdn.sqhk.co/segidexu/JGheiah/39824308377.pdfIn PDF document text
    • http://strapslap.online/non_corrugated_box_meaning7i86s.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/ajba7if/85965961163.pdfIn PDF document text
    • https://cdn.sqhk.co/taxosavasesa/gOgdeaG/rogimobitidadip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367000/normal_60038c0347c14.pdfIn PDF document text
    • http://covid-19online.site/7_sacramentos_de_la_iglesia_catolicazida5.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/jbhhVib/stick_war_order_empire_mod_apk.pdfIn PDF document text
    • http://copyrighthelpptteam.com/hitachi_ultravision_tv_not_turning_on021i4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_5fd1a2361262c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_fbc416b1ffd6411691efbd69a3321d45.pdf?index=trueIn PDF document text
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_daf91888e30947d3aa02fc2b6051fe0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0189c43-abcf-4131-a1fb-f83b210044b3/46491194614.pdfIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_702c443c38854031a46fd2c8db749a3f.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_b5ccf9896b774dada9125f0b6292de79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/804c0498-28a0-4c02-b92e-2fee5ce43604/stanford_university_design_thinking_course.pdfIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_fae39e906e114b48a2e5bcaa361a80e5.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_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 5604 bytes
SHA-256: bffed1424c03b6dc2e0134db5937c41db4922b4e86fb6a4247b33295c03fa087
font_01_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 10656 bytes
SHA-256: ea086070ca196453dd2a6f37c1a471650b67fa23fc6beeca10f68d2954687e65

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