Malicious PDF — malware analysis report

Static analysis result for SHA-256 989ddb9413c09ef9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 10:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f40f2bfe47f4d3519fcb053ed2edc524 SHA-1: 50af220061445f7904c5d8aec97922fbe75436e3 SHA-256: 989ddb9413c09ef98d5d5f49d2b8d0d3e46e7981e5ee3a0c48fd2416083416df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

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 https://irlanc.ru/uplcv?utm_term=how+to+make+a+live+photo+lock+screen PDF link annotation
    • https://kominove-centrum.cz/media/files/file/44123562875.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/40464301514.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/refazidov.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/94907654625.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/modikotelusajitimid.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/giwetutogubosutujowiku.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/57652604902.pdfIn PDF document text
    • https://wittnebel.dk/file/venodusaxadepejowepovet.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/51444095143.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/r4r09iof6bg830b355b2u81071/rewom.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/zewenugedawesovadilo.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/jomosirowebepu.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/85386995954.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/40220104836.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/kuxadosozad.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/naxazinalokekidut.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/16188132536.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/47535520266.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/pakikimodawuw.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/fakowavefupobomowaziwo.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fepoferezorif.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/28222294219.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8fb5c3df24881a7571e2c89a9db677ce/48413110615.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/bujususugefazobavakafiji.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/pagogenogonatoxumadokaxi.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_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 19340 bytes
SHA-256: 89c977748c8b99dbae91784c75e2b89c8e41d77985184892cafca4de163d89b6
font_01_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 10872 bytes
SHA-256: 831e0d469d218a210b0c7be00d4f1198db87306776e9690e7e463d1053a5e851
font_02_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1