Malicious PDF — malware analysis report

Static analysis result for SHA-256 396ec9b66c530df3…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 11:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c2109c56ce66dfc0b6fbda9ed1a01b9 SHA-1: de68ac6528b2475ca33710aab50d746bd370902a SHA-256: 396ec9b66c530df3860bd8f1be082a628de458cf932898c4daa00f6e6516616c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one pointing to a raw IP address, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly support this assessment, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bela.geekers.tw/upload/file_folder/file/guvogobotomikaxeginop.pdf In PDF document text
    • https://mabuksusu2.com/contents/files/ritovewe.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/gujizubikazos.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210906_043555_191.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///vuraximoxefazuvep.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/sijuber.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/91033261240.pdfIn PDF document text
    • http://byecook.com/ckupload/files/74909156109.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/15757263684.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/logererokirubiguzikunipab.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/nukatip.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/gijofuxogoxubalivabo.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/zupinapajofixalopesi.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/5642815257.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2e89711643cf551b929f04a2456b037c/2625147599.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/sunuvupotar.pdfPDF link annotation
    • http://clinicaveterinariagussago.com/userfiles/files/xiriza.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/kuniziwifebutuger.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/48125563240.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/67027150042.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wixabefefi.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/61376768750.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/6446353221.pdfIn PDF document text
    • http://selispin.com/calisma2/files/uploads/58644086435.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/91121428303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=win+10+launcher+proPDF 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_off0000bf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2C 10472 bytes
SHA-256: 033e9a926e8d0c6d3ff1d5c67e62a2b6adca7e3d382b12aaf003baeca8a2b1db
font_01_sfnt_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 16728 bytes
SHA-256: 7fa432d5d73b420edf1f882f1cd8e19e885da5bb4d2e05187a0ca5a8b2fc6f3d
font_02_sfnt_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1