Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4db302ab81b5ab4…

MALICIOUS

PDF

92.9 KB Created: 2021-03-13 17:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5292437bafd22544b922411d9f40c5ad SHA-1: 5ee4120b0450fda20f6f3dbe4c6b9c026706fd1c SHA-256: a4db302ab81b5ab4022f1bfeab758d91456f6daa873c41bbabfa6e1dccb1169c
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-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.
  • 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://nipisod.ru/wix?keyword=duke+econ+major PDF link annotation
    • https://forilulan.weebly.com/uploads/1/3/1/4/131408022/2ad0ee.pdfIn PDF document text
    • http://iqecoportal.ru/formation_assistant_chef_de_projet_informatique419g5.pdfIn PDF document text
    • http://formblckr1.xyz/xutugajomerizudokarazupi34yog.pdfIn PDF document text
    • https://gemunokixelu.weebly.com/uploads/1/3/6/0/136095878/9116727.pdfIn PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/8750866.pdfIn PDF document text
    • http://septiki-rf.website/laluvusewarumanaxazufemukuk8.pdfIn PDF document text
    • https://gibekadizekuni.weebly.com/uploads/1/3/1/4/131452913/2892503.pdfIn PDF document text
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/nozinep_gedogupizakuvuk_gojili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa92bbfc-0a9c-4696-aa5b-2f2b470f9190/bosch_glm_150_c_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/659e3c50-28f0-444c-a8fa-cc2439a708d8/87408445702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a1072c-dcd0-4f26-94ed-3b8f6685d3f3/which_of_the_choices_is_called_the_age_of_reason.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/oxford_literary_terms_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d3116f-bba6-471c-917a-877dffd5e182/priscilla_shirer_armor_of_god_week_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/tabumif.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/email_form_html_php.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f210054c-53b2-4ca7-9b33-f3ec9d598279/best_money_market_interest_rates_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21826bef-7d52-47f8-9860-2e5a9ab6f5b1/the_care_and_keeping_of_you_2_table_of_contents.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/example_biography_apa_format.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 4876 bytes
SHA-256: 2a14be115b5403ac09d2ec7df34b1568a94c0cfa01bdc5af90f592fec333c0e2
font_01_sfnt_off00013bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEF 12292 bytes
SHA-256: 62e5c4a5ae46c06cf4ca75629343816f29284697984748a36e912f01479bdc13

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