Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c617c578d205ca8…

MALICIOUS

PDF

79.4 KB Created: 2021-09-22 16:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98153c4d969e09f67298f85e97686076 SHA-1: fd9a7cf538d715965a719be7674f81af74f46daf SHA-256: 6c617c578d205ca884aed638702325132aa1517101fa183b758362fac3e26b74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://nomylo.ru/uplcv?utm_term=video+to+audio+converter+for+pc+free+download PDF link annotation
    • http://fullerton.kopanramen.com/uploads/files/xesewoxexonogobudakiwefej.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/48224258113.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/fuxinujanomikimigigukida.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/66516974699.pdfIn PDF document text
    • http://naso10.com/userData/board/file/81522739793.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/30125012439.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/winakefo.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/93086689094.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/30360174984.pdfIn PDF document text
    • https://sharenkon.com/files/tasidafaxugeb.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144e628decc9---mivexesugeru.pdfIn PDF document text
    • http://pactolous.hu/upload/file/65616077875.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/5720988620.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/sirozogumukazebakigitafe.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/88490788155.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/tijujeduxenesifogad.pdfIn PDF document text
    • http://kahasat.cz/data/file/mafisotogipofuretodajezub.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/nubemeg.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/38891114987.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/dajazuloberuvumakuxafup.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/wedinadesolelodes.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/75208563494.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/10328054987.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/vewasofoxetanaw.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/muxowesakizudunosovewuzog.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/dupifojolafuruv.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_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 17200 bytes
SHA-256: 298fb4aec306651ca7213c8d3acb0812049d4399af503ba8533633d95fff4f89
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 10668 bytes
SHA-256: 5b8d018ca19f528a3c7fe16b928958ed17eec4f2eb55451b7b3d325e7cb6fc58