Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ecf3733a1e2f1e…

MALICIOUS

PDF

74.5 KB Created: 2021-04-05 01:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8b120b90d7b141de40aba00acafa8f27 SHA-1: 5268d1a9e8a369b5f50f8be42e049c762db544c9 SHA-256: e7ecf3733a1e2f1e048a4758bf45ee925cdabe144f6bb8f95ffcb565be927b21
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=how+to+insert+equation+in+google+sheets PDF link annotation
    • http://mibotirekusiw.mywebcommunity.org/xosisufinetomeno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484632/normal_5ff588522d3d3.pdfIn PDF document text
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/dcac707320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_6029f32d680fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_6018686379703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_605af62737670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_605f5c8b2f46c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485573/normal_606407714301a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_604fe24f5fc05.pdfIn PDF document text
    • https://pefobasor.weebly.com/uploads/1/3/4/1/134131397/gadononitepewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_605f664a51f5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_606a07ee5756f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zapavuvezozetet.epizy.com/can_you_send_money_overseas_at_the_post_office.pdfIn PDF document text
    • http://ruxusanufip.rf.gd/81661870383.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/what_is_a_waning_half_moon.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/actualizar_chrome_android.pdfIn PDF document text
    • http://jujuletofu.onlinewebshop.net/walumidumune.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/daughters_john_mayer_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/beferufuzidoredodajowise.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/atraumatic_extraction.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_off0000e6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 5128 bytes
SHA-256: 75bd9125e5f48a0c528312175812b779ef2114488e922c74dd5542fd45cf097d
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 10508 bytes
SHA-256: 93c1cfeb18d666b846bac925e2496b3024e38c1b23c77566ab2abad907d2c0aa

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