Malicious PDF — malware analysis report

Static analysis result for SHA-256 87331bb3afa532d5…

MALICIOUS

PDF

98.2 KB Created: 2021-05-12 00:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 404ac82d93cdfdd7cac09a44837d8351 SHA-1: 28839ba29cf25af16b17a1711dfedd63e067423e SHA-256: 87331bb3afa532d57f0d1b167877b45674dc64f12d917dc7ca3f114d1022448d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to disposable hosting, suggesting an attempt to distribute malware or phish credentials. The document body is heavily obfuscated, but the presence of external URIs and the overall detection profile strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=does+hulu+have+wolf+of+wall+street PDF link annotation
    • http://sijufur.22web.org/bewobiwadogomajinorolo.pdfIn PDF document text
    • https://cdn.sqhk.co/namemedoxake/nghGDgg/37019866918.pdfIn PDF document text
    • http://dostafood.xyz/liwexini99nvu.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/Qjijau2/wujizipusegeburi.pdfIn PDF document text
    • http://lidzadva.xyz/bcs_book_list_download7q26y.pdfIn PDF document text
    • http://swast-group.website/cia_guide_to_clandestine_operations047zl.pdfIn PDF document text
    • http://sosed.market/gufomavobof7maf.pdfIn PDF document text
    • http://axecheat9.xyz/how_to_spray_oil_in_air_fryeri8kbx.pdfIn PDF document text
    • http://digtalcaliper09.xyz/pexonidv2jr7.pdfIn PDF document text
    • http://bonboxstudio.com/40062595460438mc.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/learning_from_las_vegas_bookpfod0.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • http://lp-consalt.ru/what_are_the_core_beliefs_of_christianity_brainlyljg2z.pdfIn PDF document text
    • https://cdn.sqhk.co/rovonoset/Ujcjbgh/32857935791.pdfIn PDF document text
    • http://weex.info/faxebije649pw.pdfIn PDF document text
    • http://wagagawoduzom.iblogger.org/mujatujevogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xibiwoziveva.epizy.com/rediponibewipanuvumilu.pdfIn PDF document text
    • http://toxitule.epizy.com/team_member_introduction_ppt_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f16ed3d-e387-47fe-a9e6-70c82b752a48/overall_tone_of_the_weary_blues.pdfIn PDF document text
    • http://zowomazo.epizy.com/holt_texas_algebra_2_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ac2474-a6fb-4db1-a693-baf7061fec2a/porque_se_tienen_que_extraer_las_muelas_del_juicio.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001409c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 5008 bytes
SHA-256: cc6f9ec1503d84b5d7e10248ade80e6f884689288ef7ba6b748972c1c693a206
font_01_sfnt_off000151bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BB 12376 bytes
SHA-256: 72190ea5cf14f2203256833ec7b58bd991c28c252f55fc895bb664686992e55a

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