Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5478f5f34e556e4…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 04:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 693a40137a996d9478f20e901fe87d92 SHA-1: 1d0831be64fa9e1816b77aa78f9524f80149ac31 SHA-256: a5478f5f34e556e49c6ca89a49da546fa85d8441f58aee43fe208cdfa7957ceb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, suggesting a spam or phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://debten.net/UserFiles/File/87575437050.pdf In PDF document text
    • http://naturpix.ch/cmsimages/file/26691960130.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/niroxinitekivuwapabog.pdfIn PDF document text
    • http://888chji.com/userfiles/files/8462076109.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/netoduvuxigozawakelif.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/58824799095.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/kawumilavulawafel.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/diroxuvefijanakiwegagede.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/85852556490.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/wusekakejadatoniralafoko.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/zowaletikej.pdfIn PDF document text
    • https://cncunse.com/d/files/regesezowavajekos.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mafupesawu.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/jowegepudofalazutamaju.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/51323301630.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432223f1aef---95814063169.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/25592606590.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/64386341501.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/wutejagu.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/fuwutejefusekiduxibobek.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/58390504571.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/37682960918.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/fogezupowizoberokitanipu.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/59250267745.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/vusivozozet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+smart+multimedia+player+q7+manualPDF 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_off0000b02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02D 15412 bytes
SHA-256: c3da80e038a6cb504db38f589a6810abf957df8e4f93458875639654350f3d8f
font_01_sfnt_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 10944 bytes
SHA-256: 67713093add11b361b347ac31014531d4b21053adcef82b166fb032b3c9e6147