Malicious PDF — malware analysis report

Static analysis result for SHA-256 1954b3283123e7ab…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 23:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60d3ce2d3d007ef752dbf5c0cb0fe52c SHA-1: 25b73572d851cd4954a19471a298953af188613f SHA-256: 1954b3283123e7ab9b613e462875dc36adf80a799d42630dc4e35bacd2445da9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it is designed to lure users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=free+shooting+ball+games PDF link annotation
    • http://aeusjtu.pretty-match.com/upload/files/7336419787.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/49835750503.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/guworenikosilexopene.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/80593690553.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/sutilidagiwiv.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909135253568142.pdfIn PDF document text
    • http://jarosi.hu/files/file/debufejog.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210908120448.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0c20d85a4072a331ebd139af450b3bd5/gufujujazu.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/xizopiluburuxezibetifuwu.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/nofabizonogaxowabikine.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/82332555991.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/63961890086.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/gajulo.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/fuvokubovuxaba.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/rafujesazawesiruxedige.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/44814637790.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/236550844.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/10051210903.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/62228735802.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/zoramajizaxosim.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/4075889140.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/30059651167.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_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 17268 bytes
SHA-256: b7c35eefb512d18902fee2ba546162b3c6bdacb203e63a9efe4f99aa0c87273c
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 10672 bytes
SHA-256: 8a641a39d7efbdb720d4ec85e94a6d6414fa157dd8b991cf19accfd3478384a2
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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