Malicious PDF — malware analysis report

Static analysis result for SHA-256 0106946472de887c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 03:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f9f2607255e5e8bbba53c25bf2274fea SHA-1: c511d2cbfc155def3c6d76d008ec5574b3f5a5d0 SHA-256: 0106946472de887c264950723b54cbcac07aded85000113e5e155aa18f6ecf4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high density of links across many domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution point towards a link-farming or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://varadimasszazs.hu/uploads/files/20329075491.pdf In PDF document text
    • https://sanmuabancongty.vn/images/content/files/wezalowovevawasulazisilop.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/keruluxiborewejupuw.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/18335839229.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/56908801940.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/81669152786.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/86750610081.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/61187187900.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/polozegubariweloluje.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/zinifilota.pdfIn PDF document text
    • https://isleo.com/i_photos/file/daxanumunimididu.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/97922863755.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/1456176470.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/28592229437.pdfIn PDF document text
    • http://agilesolutions.in/uploads/gajagabuzofataweja.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/10417678581.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210927012939.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-25/20210925143832778164.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/91949104445.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/junusinupov.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/sutotol.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109051728328918.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/98435638973.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/nareruxiwufudixemilolibe.pdfIn PDF document text
    • https://jensbrode.de/files/file/68000007893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=link+ps4+controller+to+androidPDF 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_off0000af68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 15528 bytes
SHA-256: e61466e7dd25a8f28d33796129b549f7c5cb3e459affffdc35dfb3b199502166
font_02_sfnt_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 10632 bytes
SHA-256: 0348f342392da7322c37c570c8c304df8c84e7e17806fc58a1ef13239e5c18e7

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