Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38d28597e99c76f…

MALICIOUS

PDF

77.5 KB Created: 2021-04-25 11:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32ae7119fb13af3b12c71c1bead20557 SHA-1: dde10f02b218d0d0102d9a4ed872e78f558a5b26 SHA-256: c38d28597e99c76f0f785ba217f9e4d5f2c5725e8e0113c646261fc7fc021cbe
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://mezovuduw.ru/strik?utm_term=english+speaking+course+app+for+pc+free+download PDF link annotation
    • http://nejozewowedona.22web.org/canoscan_lide_25_free_windows_7.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/how_to_pick_godparents_for_baptism_catholic.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/assurance_and_insurance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_5fe970d9898e0.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/voyages_in_world_history.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/jghgEhB/73878746172.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/777ef2a69.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/iaEhhja/xatata.pdfIn PDF document text
    • https://juvosibizojeguw.weebly.com/uploads/1/3/4/0/134040958/373040.pdfIn PDF document text
    • https://gitarufimoka.weebly.com/uploads/1/3/4/2/134235546/pajix.pdfIn PDF document text
    • https://vavetoros.weebly.com/uploads/1/3/4/8/134854671/235e9ab79b6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_60111f60cb5aa.pdfIn PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/45116369f.pdfIn PDF document text
    • https://cdn.sqhk.co/temokika/Q1jg8bU/assamese_whatsapp_comedy_video_2018.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/53323297642.pdfIn PDF document text
    • https://modulofironufi.weebly.com/uploads/1/3/4/4/134402713/dusaregesik.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/hhMicjf/xugokerolonemitefawened.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_60599b45ec67d.pdfIn PDF document text
    • https://vefurubaturuxal.weebly.com/uploads/1/3/0/7/130739777/9653229.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saperemobopiga.epizy.com/brookfield_zoo_map_2015.pdfIn PDF document text
    • http://porilebunenagu.rf.gd/maserati_quattroporte_for_sale_houston.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_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 5532 bytes
SHA-256: aa4f04a86c27589ebe839b92941389ec17aa0676a33cc0fdde4e24962af64992
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 11140 bytes
SHA-256: f71cde9a53ee842fffc8a29698e78a962a03d014bdbeb751a218f6e7e8d51349

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