Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d7d1910ec64869…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 11:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df80240a9235884f9b5a5fc30dcda388 SHA-1: de15e240af730bacde9e66aac4d87725903de579 SHA-256: a5d7d1910ec648693fa86b638b7d5b18995d72677836b6ae8eac89df4ef9951f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to unknown or suspicious domains, indicating a link farm or phishing lure. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classification strongly flagged it as malicious. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary goal is to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://taxplus.in/images/contentimages/files/xedavaxobikizumavamo.pdf In PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/vasupezizakapev.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/58329473292.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/fewimogudovumavidorogu.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/54175110189.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/23427777774.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/matusalixigenopo.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/28463814902.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/68186147104.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090310584925.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8cd965e9c26236d09f2badedc1890f9a/wiwigakupasodetidem.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/towosowivejepipesi.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/49818740435.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/kirisapulet.pdfIn PDF document text
    • http://edituj.cz/res/file/61480841931.pdfIn PDF document text
    • http://paliukenas.lt/i/File/xujiselanowobamelagi.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/64292724438.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/latimisebosilivesenuxapi.pdfIn PDF document text
    • https://mmszke.hu/files/file/81806790855.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/buwitanojetawabuvobixula.pdfIn PDF document text
    • http://erictex.com/ufiles/files/lofaposemidekiwojokavorit.pdfIn PDF document text
    • https://casaalu.com/luutru/files/2971491790.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/39272010570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cara+publish+app+di+playstorePDF 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_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 10768 bytes
SHA-256: 52c03fe0a1349f4f8e66f9dbc83189f91d1bd62a7c9768434828457ed61060fc
font_01_sfnt_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 17684 bytes
SHA-256: a6b8e2d319d3e56e0a543f9aeeb531fa5732ae4ac2deb8b4a2230ce2dd1ac2d2
font_02_sfnt_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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