Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86ef1fdb1553421…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 01:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aba4c1e602bba5508541c31dc7d131b4 SHA-1: 3bdb4011c38aaf17f566a0c521f37f416be5d344 SHA-256: d86ef1fdb15534215c1761db83304b8833e84183ef823ca33f3a0f22463aa59f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains or are part of link farms, indicating a strong intent to redirect users to potentially harmful content. The presence of external URIs and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://huntic.ru/uplcv?utm_term=menu+apk+android PDF link annotation
    • http://www.pvvc.cz/files/78524447358.pdfIn PDF document text
    • https://mkart.it/uploads/file/20528599481.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/91044108423.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/puniwulajegexax.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/20687078379.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/10722142734.pdfIn PDF document text
    • http://simonide.org/userfiles/file/80264505276.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161323ecc0b4e7---10358337531.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/moviwijexelutipiwagoz.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kafubijukizu.pdfIn PDF document text
    • http://foodchemsino.com/d/files/famanimosalexax.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/18585083298.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e74a8409c6---fofezafenagesidazesixugax.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/wevixodijulow.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109051436161229.pdfIn PDF document text
    • https://sambelteri.com/contents/files/nuvigutumovoweger.pdfIn PDF document text
    • http://twilaw.com/files/files/gumarabalomodoxolorutat.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/46674548956.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/85427232471.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/difoxibesoropaxa.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/45373491870.pdfIn PDF document text
    • http://langyupharm.com/upload/files/lonejoref.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/2472869848.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/tizigilibugoxisobe.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://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_off0000aec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC8 14436 bytes
SHA-256: 506f7fe69dc234c0c7ce148d2404d34ca1ef6f39f4961e7e666f958ae31f052c
font_01_sfnt_off0000d36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36E 10256 bytes
SHA-256: da821dc7382ec201ebff1ce11196e17193f9eeb9761ac50cd2b993831f880446
font_02_sfnt_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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