Malicious PDF — malware analysis report

Static analysis result for SHA-256 17788adc5f982d80…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 11:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0544646868aeb0be460530c99f1a921c SHA-1: fa48e636796b1558ebe3e3046ee7517f98151af9 SHA-256: 17788adc5f982d8097b867a8266f6a2b536e314db400d4f6fae6f8549ba1c356
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple unknown URLs and a benign-looking but potentially deceptive feedproxy URL indicates a redirection mechanism.

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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee224027a1---76377828267.pdf In PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/41494441656.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/99398652519.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/mawuwatojeka.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/39730552885.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/xewidetebikabikozasew.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33831273025.pdfIn PDF document text
    • https://norservis.info/files/files/47344031545.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/53017767433.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/nujulajuw.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/66632038815.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/femolopo.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/kedoxutemamezopemovubeson.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/35687623820.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/tifijimulegimux.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/31286905875.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/tirubimomekarikilo.pdfIn PDF document text
    • https://medtek.vn/storage/file/bowiwo.pdfIn PDF document text
    • https://phunhai.net/upload/files/59674181114.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/sasaxitomup.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/67740925753.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nupufexezisavolagi.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/muxatit.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/33644169947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=test+de+personalidad+pdf+wordPDF 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_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 16784 bytes
SHA-256: 9c689e2a1a85fbe7c03f4a614693bd64a179165a0043ca05a72a347bff1b5373
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 10540 bytes
SHA-256: 9f9c5e6cc6beed5e6e5c2d9f026db1a5d1e90ce87142e877fab6bee2bbf534ea