Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdab5a250ef5861a…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 18:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bfd0f920664fc18bf3da38f3f6af1fdd SHA-1: 38c8309ee0c28fa4a1b0a928c2f051dbd6f9f6f9 SHA-256: cdab5a250ef5861a5e3c6c35d8b46d949910a120ce3fc91b82b498cb0cb406c0
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 0.9998

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://crophysi.ru/aws?utm_term=how+to+oil+a+kenmore+10+stitch+sewing+machine PDF link annotation
    • https://cdn.sqhk.co/xafukapewe/ijjiijc/15504860125.pdfIn PDF document text
    • http://nonretloli.site/how_to_use_corningware_browning_dishp6ihv.pdfIn PDF document text
    • https://cdn.sqhk.co/boxumiza/tpfijhc/ivan_the_gorilla_disney_movie_cast.pdfIn PDF document text
    • http://bnatural.space/78006649079a6rj7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452386/normal_5ff950e0257ea.pdfIn PDF document text
    • https://cdn.sqhk.co/joxusozomilo/AjbjezV/anthem_of_heroes_apk_hack.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/regonedesebuzajulasi.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/vapomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_601a064fc7d23.pdfIn PDF document text
    • http://alcozerox.com/lupobevozwyrq1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5fe49c588a711.pdfIn PDF document text
    • http://bigmagazin.xyz/brother_hl_l2305w_driver2v3cu.pdfIn PDF document text
    • http://medesutaduj.22web.org/30732608190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fdcd0c057d0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445570/normal_5ffd9bd7b7347.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofijanititad.epizy.com/avery_weigh_tronix_zm303.pdfIn PDF document text
    • http://sebedugufafa.rf.gd/fupovev.pdfIn PDF document text
    • http://xanunomoz.rf.gd/manual_de_tanatologia_para_nios.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/critical_thinking_strategies.pdfIn PDF document text
    • http://malebowepapin.epizy.com/science_formative_assessment_75_practical_strategies.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_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 5524 bytes
SHA-256: ef5fd9b50b12b5f11afaf2b5048fe51e3a9cbc195539aa6871aa4701830cc753
font_01_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 10976 bytes
SHA-256: 1758cbb19fd69775482af389ae71c514057bbbcfda220258cddb29fc9a857fca

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