Malicious PDF — malware analysis report

Static analysis result for SHA-256 f911ab606cf2d1b1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 08:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23fb4936c2b77c007d2a32d26c3b1ecf SHA-1: c6f0cc702ac2c8f0df7807694e94a7e6d6b08d51 SHA-256: f911ab606cf2d1b1b54db02361f34fd7ce4ea488b5d0ff2502d4b08eb11271d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to distribute malicious content or phish for information. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yokohama-model.com/userfiles/files/22599805665.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d206a0635b---jijamivozuzatovakixemike.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/84910306542.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/bepopi.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/62147438316.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/wedemepixawokufe.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/zarotum.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/12838948259.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/fovurexikovikijodap.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/vunibonesapafolinewojep.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/zetizorinulisaj.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/lozibomokuzagezosuja.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/reguzafulegim.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/pugaxikaxurape.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/44641775884.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/jofelu.pdfIn PDF document text
    • https://cncunse.com/d/files/disesemepetata.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/wezigafukore.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/84511464275.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/lisogamip.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/tugigopapituxivoxapija.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/xovalet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=working+out+before+or+after+breakfastPDF 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_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 17904 bytes
SHA-256: 37b1c01cd13148ed8ac672d328f306f9c5ff77cea672feb32a87cdaa400d0944
font_02_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 10668 bytes
SHA-256: 77115fe2e1c181c23e796d9faf23696ef6fb09646c16529f683939105d4f7304

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