Malicious PDF — malware analysis report

Static analysis result for SHA-256 565cc543f19fb6f9…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 21:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c05459cb022eb1ec02f815deaddf45bf SHA-1: 5517afefbae9c97be7c8418a1a33b9d20a72572a SHA-256: 565cc543f19fb6f9ce07d913ab16094d6504e9e415267f48d6723d21ae7cbc10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=how+to+find+the+vertex+of+a+parabola+from+an+equation PDF link annotation
    • https://santechnikosdarbai.lt/images/files/sajodavilok.pdfIn PDF document text
    • https://arerp.kr/data/file///lagomevufanuwaxiw.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/60471808820.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54296251975.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/xapofup.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/fefexexokofir.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/95567616703.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/gexakelunu.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/20826384813.pdfIn PDF document text
    • http://drironcat.com/images/file/xijuzobugotumazadevusib.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/tidijulutojokalimenebaxuf.pdfIn PDF document text
    • https://foulardfotografando.it/file/goxalegadopajin.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30178383501.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/31239934316.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/juforure.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/34312510682.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/tenigerowagox.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/45205103232.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/72768949459.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/rupidajesawezakaku.pdfIn PDF document text
    • https://iword.de/userfiles/file/votofotased.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/domerufefagaxurubaxabot.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338da91e2c4---fowowetowivoviximabemu.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_off0000b1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 15860 bytes
SHA-256: 99f879561f2d57f421774c76e293ba195201e5b0c879e8b292acd1329f21377b
font_02_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 11228 bytes
SHA-256: 05a80915e856d5b92ed1e6e8856ccb4e3c73115289c5788087d7d9f2a4693d11

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