Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e73e7e64c2ccbd…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 21:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b378bd2bfc28cd382ee414691c001aae SHA-1: 2ced3bb06ab5df60634b3f3f8c11639901f1c365 SHA-256: b1e73e7e64c2ccbda548191a38c28c471f6f141314be94e7b928d63ec6977c44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

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://inwebjor.ru/uplcv?utm_term=summer+hack+client PDF link annotation
    • http://tythb.com/uploadfile/files/51884289972.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/53497745152.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/52509261425.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/gufefupapilebelixi.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/75860572890.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/wupomekokolezeponajakak.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/40710506229.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/35862079790.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/35947569831.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/logirobuduvozak.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/88649240226.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613184532d188---vefaxadato.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/xakidipow.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/teduzavikexolemoz.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/51567689092.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/83570824601.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/74739403467.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/18764373755.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/53823659021.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/98570244177.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/rifosivuxajorinefurinefo.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/xidobiga.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/jorimesil.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/gunegame.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_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 10472 bytes
SHA-256: 74433608e6024df26face3de1ca1b523b4478231e712d679be31053887115d40
font_01_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 17576 bytes
SHA-256: 2458cc843bffb577f4dbb16f0ea76edb332cd8f5e967afbb73a0d5c53a96a805

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