Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61d0138fe10dbc2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 05:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4987f70ced87f5061c0adb934aa06486 SHA-1: f952ebbe4038aaac4e7657ada8cce6da27d40a8a SHA-256: c61d0138fe10dbc2353bf90cf0c40b17cab2dab5f0c5bddd854b975a3107ad0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using numerous distinct hosts for links, likely to evade detection or distribute malicious content. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://weingut-suppan.at/files/57415704943.pdf In PDF document text
    • http://turinhotelcompany.com/userfiles/files/309290924.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/51725415907.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/66416167897.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/40279735811.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/xagowasojalinepupudol.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/34052604068.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/76246405895.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/18107652195.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210917175813.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/81064967228.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/motomiwivajutawodom.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/26321123967.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/kerusogenumodixutojagek.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5vacn4ad9vrcdursomsj6bc5lr/kidozux.pdfIn PDF document text
    • https://sanidom.pl/img/file/69292535597.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/sifevunigaxex.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/93902355579.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/43806207682.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/78262629629.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/56415784185.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1a2726cece3b87eec30a3871d2818555/76071260249.pdfIn PDF document text
    • https://patc.fr/imagesfile/guxabizalutakobewe.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/65485396149.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/nefukivajawamezexawawagip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=my+policeman+download+pdfPDF 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_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 17384 bytes
SHA-256: 1b4acae345ccaeb9901dd6d14ef87056a640b187aec0a7ff33db629591e42fb8
font_01_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 10608 bytes
SHA-256: c1e72e8b270489710738cd20019b9d2e1901a8007ae41936133445755ffec417