Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd932354e2ccfd61…

MALICIOUS

PDF

73.0 KB Created: 2021-10-01 13:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7e1a8dd07c64641b0ce37aa12a157be6 SHA-1: 141f1d49c423d89225fbd1a8f168e5a6c6d946ba SHA-256: dd932354e2ccfd61b1ae190c4c182ee0050d26b4485401559d2db2c74a828f15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, with one URL pointing to 'nomylo.ru'. The document body contains garbled text, suggesting it is not intended for direct user interaction but rather to host malicious links and potentially exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=pogil+neuron+structure PDF link annotation
    • http://rigosarchitects.gr/userfiles/file/73652473554.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/wakibawuvines.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/17254571888.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021928204443627.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/dezamojoxu.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/36712731737.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210925055518.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/12315150177.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/72309860608.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/63933821655.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/44288704736.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/jamuv.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/83vk7separi5u95qbip7cs6c61/ferelafukiroj.pdfIn PDF document text
    • http://splogservice.ru/content/files/tefapazinapajetazunum.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/vozuvatifeluwifexe.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///gupivovinotenisu.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/52549316470.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/88712853856.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/69156272596.pdfIn PDF document text
    • http://benetalent.com/upload/files/45773068823.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad4cf5f6d9---binuvejatabopadiguvon.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/wubiloxivaj.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/nudorevulumudubuvalikekog.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/76002115933.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/kulosi.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_off0000b6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A1 18440 bytes
SHA-256: 8b246dbbf07324f6e6b7b84f8c45baaf6434850bef862ee96faf9881c10b830b
font_01_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 10344 bytes
SHA-256: c2178db91c9d0bbf111d96224dce1a2ce01d8b832c70e148d334ad78198acf23