Malicious PDF — malware analysis report

Static analysis result for SHA-256 98741cd1e8fd719f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 05:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71215d90462057f6e0ce6c28801925eb SHA-1: d3f66cc81188606c6aec919c2008ec6fc39fa52f SHA-256: 98741cd1e8fd719fedf6beba1fe0f7c91f8f57a227be6ebfe82bbc21e4377f9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=surface+windows+rt+8.1+to+windows+10 PDF link annotation
    • https://generalaudit.pl/eurostyl/photos/file/digevi.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/32821172405.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/jevukub.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210903070659.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/buvedexujunatofivizigixuf.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/59868024459.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109010800355717.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/99129183420.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/55958013477.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/pajakudetorepufolokipo.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/77692237060.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xofuwulizibovafiwodejaz.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/14120382893.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/dukisibize.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/wuzoridibutemuse.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/79699734478.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a42aecb224---89316020311.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/67d449865f190fc7a4e2fbff1fd164d5/35362317426.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/vetinilovij.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///4078054721.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/87089035443.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_off0000cc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 11132 bytes
SHA-256: aa12be1aa65c1e37b93d8cb1eeec8a17ca23f07351d6b215dcc6c1cc4a5d7064
font_01_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 18620 bytes
SHA-256: 6ed108667412e141d7d390f20e8499b8e58c46125634962c8921847f9b88c625

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