Malicious PDF — malware analysis report

Static analysis result for SHA-256 392e9bca4120e55a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 09:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8db5e2748ab9c1443d23259e19ccfc5e SHA-1: 3ee624fa976ff6678044f9f15cbe5adba4cb36ba SHA-256: 392e9bca4120e55a4ca6d0777e24fb1e90f57856d59e710a10020affa8b88b17
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files, suggesting an attempt to distribute malicious content or phish users. The presence of 'utm_term_redirector=True' in one of the URLs further supports the idea of tracking or redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://tomaszskiba.com/userfiles/file/matifotes.pdf In PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vufarexevomuvi.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/siwafuvuvuluxaxitariruz.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/totanaxebexa.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fizevulefilenivesuza.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/47817740068.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/migowa.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/17870128485.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/96311927195.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/pimomamirovuve.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/caqp81hf9nrq9hajn489ergf4p/94007689999.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/pibesezuvikubo.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/kejosurozatekiwoso.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/74944432511.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/80372786615.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/33340378789.pdfIn PDF document text
    • http://africareview.in/userfiles/file/dikubisilizafa.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/zavibalipeboposuzobokewe.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/36757453925.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142345ea392a---damexu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/18227752965.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/19552977456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vivo+s7+language+settingsPDF 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_off0000c867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC867 17932 bytes
SHA-256: 8d57341d0cb228e7e79f52d52480b22dc20d346f53f77be1773c1187665c448f
font_01_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 10368 bytes
SHA-256: 2affd5c07f27dc586c0ad63f7f71265f7e10c0a71d4ae975b49571f302e77b1f