Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0985a62daec78e9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 09:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ad3547ea4acf2083f4840c504057b65 SHA-1: 505b9e2d18abb668c23a3143b58f75cbf4b5b73c SHA-256: e0985a62daec78e9d956e2c25ec5eaeb0e9eb59846c322997d7de25a4a1c78fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and a 'link farm' heuristic indicates an attempt to redirect users to potentially malicious websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=different+types+of+emojis+with+names PDF link annotation
    • http://h-p-n.fr/catalogue_dynamique/file/medidixujasebixu.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210921102542.pdfIn PDF document text
    • http://falconltd.pl/cache/file/rilosaso.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/53867855208.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/61533880062.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/xojotupopirisuk.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/dadexiju.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/58544953089.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/buzurava.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/vimibolez.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/78495156586.pdfIn PDF document text
    • http://c-six.it/userfiles/files/fofebexuxut.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/38649485071.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb4d497212---29035676040.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/jefovuwetarupazera.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/36291377504.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/67185905865.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147ab46f1fde---72283476974.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/vibefifubib.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/29146223830.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/23234057110.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/xerofazovo.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/sokovadenilenevu.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_off0000cf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 10908 bytes
SHA-256: 98ff6e94370931448f4b18ce2299d065dfa73555033ee1ab8713374ae2a4dd71
font_01_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 19536 bytes
SHA-256: 82280f18ccb899cf0e25a4b52bee29d303c905016838907ce1f75a469ffd97a8

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