Malicious PDF — malware analysis report

Static analysis result for SHA-256 174e7f0eecb8091b…

MALICIOUS

PDF

78.6 KB Created: 2021-03-28 09:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cfddcac55d6b9e3d98948356b31e773a SHA-1: 35f86af2f093b6e90dd5432977a8492ed12adc80 SHA-256: 174e7f0eecb8091b443d1766861091acf20dfa8c2d93d30c84fe0efb7eb4f86f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=6.0+powerstroke+egr+delete+kit+install PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5fe9d375a08a2.pdfIn PDF document text
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/6477352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_6031183f9a6e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483587/normal_5fe0807076e3c.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/gagojagofurivi-zelugigimig-togorazoda.pdfIn PDF document text
    • https://javexediwoxi.weebly.com/uploads/1/3/4/5/134584379/ninopunesobakabuwav.pdfIn PDF document text
    • https://cdn.sqhk.co/pujunuzivas/gfhjfhf/conquest_synonym_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_601f87039aedd.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/jaterexarozudi_nomop_wefowogitek_fujetud.pdfIn PDF document text
    • http://zikubuji.iblogger.org/fowaxakisanabulaw.pdfIn PDF document text
    • http://sevosegopuro.iblogger.org/derosive.pdfIn PDF document text
    • https://popewike.weebly.com/uploads/1/3/1/4/131407195/8039576.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448129/normal_5ff9ead3520e7.pdfIn PDF document text
    • https://cdn.sqhk.co/soleximu/ageJge3/off_road_forest_mod_apk_latest_version.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/tawin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godemesefiw.epizy.com/reliability_centered_maintenance_training_indonesia.pdfIn PDF document text
    • http://zavukazena.epizy.com/about_social_work.pdfIn PDF document text
    • http://xujijanuzovaziv.rf.gd/47023953005.pdfIn PDF document text
    • http://bodagoge.epizy.com/sample_progress_report_comments_for_esl_students.pdfIn PDF document text
    • http://xazasanedaned.epizy.com/suketamenegobadeso.pdfIn PDF document text
    • http://jasigobup.epizy.com/9342023485.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_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 5516 bytes
SHA-256: f9e486a2b2dbbb5a6192c227fcabb690506e816e13325152af8b097cbd69bb7f
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 10960 bytes
SHA-256: 63d32fc9aa9dc793219a65304b6f7a3515cfaa47d33e177ea1a3168fd12f3a0e

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