Malicious PDF — malware analysis report

Static analysis result for SHA-256 3790c2eeb51bf439…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 02:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 95493679102dad3aacd63cf2f0edcf49 SHA-1: bf7690a95051075f328873698091a457b4a29ea0 SHA-256: 3790c2eeb51bf439c6992b3268aade83b3eb096adf045d1621c95b34406e50da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to link farms hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kltccompany.com/ckfinder/userfiles/files/61692236140.pdf In PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/bimekewevuxukutire.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/nenofobaneb.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9d34e9bfab32ec58e9d1dee5ba35322a/wobarojejedikosu.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/841659076.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/25371135776.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/zuxolibunadunelixosuwob.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/17985280696.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/kotunosuwalinukajiso.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/zojabegufojepodave.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/butirab.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/35288559709.pdfIn PDF document text
    • http://newshop.jp/archive/file/79510316420.pdfIn PDF document text
    • http://ultrarelaxedcbd.com/newerac2c/userfiles/file/16341745536.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/duginorilax.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/gojanaxaxonabekoxe.pdfIn PDF document text
    • http://sdes.in/uploads/58519180471.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/lurofononexapazoj.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/6491190718.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/93571444818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=english+unlimited+upper+intermediate+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9F 15896 bytes
SHA-256: 6f7f6fd45232ef8d0b893c202ee26d34f359e8f26c7a2586584d8a574aeedeb1
font_01_sfnt_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10908 bytes
SHA-256: 103a26cd9169612ca00c9603db8cd118329d929b4900d232795ef7ce4fc745c6

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