Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c66fb9fe9959fc…

MALICIOUS

PDF

71.6 KB Created: 2021-09-13 21:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 06cbfef94603528f0be0963659fef59c SHA-1: 1c4e1b480a149abe936b10bd13a65b4c08024eff SHA-256: 50c66fb9fe9959fc52582deec1eaea18b423a2f4c7f9f38edafa06668195f8d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a large number of embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://chaukitchen.com/uploads/files/35930380696.pdf In PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/21088768930.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/wewesexiwajativilurap.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/27344235279.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/zimerikenexuxa.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/fifajozodum.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/22387593116.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/82816061788.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/71854369587.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/89815729186.pdfIn PDF document text
    • http://dsagco.com/Upload/file/nokazugafabenu.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/22822899366.pdfIn PDF document text
    • http://www.moyekolodin.com/files/devubak.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/zinozov.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/45570852597.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/nidat.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/98947451699.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/31480219262.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/26087417736.pdfIn PDF document text
    • http://kotolantopeni.cz/file/tutawezij.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210905_47BCBEF79995C6CC.pdfIn PDF document text
    • http://grabnerestriche.at/luripidanixeburidole.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/lekene.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/8165516562.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/36127200671.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/40566079337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+import+contact+from+iphone+to+androidPDF 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_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 10748 bytes
SHA-256: b184d8758f8959e07a5d74f5de899dd0a625e7a095fee659a674fce9a6779e63
font_02_sfnt_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 15508 bytes
SHA-256: 766267871f09c70fa9605f62b223bcb3e0b2580390adb52ae15a8bb2d89ff1ba

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