Malicious PDF — malware analysis report

Static analysis result for SHA-256 9837eb7dbe63628c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 13:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9c46ca285a72c0adb588abb8d71d5f1e SHA-1: 4575385592dd50f3090e49a7d3a38d85bfffd8dc SHA-256: 9837eb7dbe63628cc4febd1de46e6e9202cb933815b1e51ba7a34a9255f8b6a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://haidangpc.com/contents/files/witesabas.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dc11dda4e1bf3352a36c60b0e4aeeecb/59846482092.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/6032076912.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/97326228960.pdfIn PDF document text
    • http://soc-in.com/data/media/files/19357934479.pdfIn PDF document text
    • http://elpijisystem.com/file/dokuniwuwe.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/94103846614.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613870453993b---76307068639.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/21159034765.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/75590558461.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/buvivitugifuni.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/dizefid.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/bodavijitowuwalajapavu.pdfIn PDF document text
    • http://orem.mn/uploads/files/70757838101.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/pukedoxegikefakup.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/gesatolonizaduzarebuvaza.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/22325428212.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/08/pegesuvujawupanopud.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/3406003131.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/vusonokobenap.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210904164354.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/91086727396.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/32505829719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ppsspp+games+download+apkPDF 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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 10624 bytes
SHA-256: 9de853e630a3ab9b5b2dd7a7aeaac476864e1e032b874a7e4203667bf3dabafc
font_02_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 18080 bytes
SHA-256: d6023de28a4c9f03f80bb33160ec9a369bb7ccf76d6f06f171c192dc4949629c

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