Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e7fbce6c869d1a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 18:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7383efd23291c17cf0a133976daa407a SHA-1: 0b7fbdf594541865e8b8578674b5bfa2e0b1bb67 SHA-256: 64e7fbce6c869d1aba609a232a61c04c034ac96f090178117ced737d9770b19c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=android+mobile+application+testing PDF link annotation
    • https://wietsevoermans.nl/ckfinder/userfiles/files/kuwumunafibufijug.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/fuzax.pdfIn PDF document text
    • https://mattress-leader.com/media/54109017783.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/1424959813.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/losawarokajo.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/neseridup.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/rabofad.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/vivamob.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/nerarezigimule.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/78872744940.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/49524196801.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/mikigijizifikabanon.pdfIn PDF document text
    • https://ms1oke.com/contents/files/38167375117.pdfIn PDF document text
    • http://stl-hk.net/userfiles/45379460854.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/suzusewinetizefigepanuxo.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vadajewudepifesozux.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/zikekafij.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-11/images/files/75560828099.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131db3d5fa54---41935562268.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/buvijofipukoguj.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/xevivubojudedatorero.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/43420969826.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_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 10980 bytes
SHA-256: 2e1180261d228c26aa57fb3b50571af89d0743e430abe83b796bf254d4a72a1d
font_02_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 18356 bytes
SHA-256: 5b323dcff440737d1a44f848eed8e8539b3c8f15684427ed108b513439d2ea2f

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