Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f8256fe21b9f90…

MALICIOUS

PDF

79.8 KB Created: 2021-03-17 02:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: af18d042bd93ae2841f298ea61fd7993 SHA-1: 59880eafa1838a60b0e825a15608f374dfe0c641 SHA-256: 87f8256fe21b9f9035a6e969bedd475de3bd2852bee7ebeaa13a01d678a16d2b
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=drastic+ds+emulator+apk+download+latest+version PDF link annotation
    • http://talebakela.iblogger.org/board_diversity_policy_template.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/gfgfA7J/sanudibobenuzobijik.pdfIn PDF document text
    • http://lirifajo.sportsontheweb.net/design_analysis_and_algorithm_free_download.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/vegel_remukiv.pdfIn PDF document text
    • http://komamoj.22web.org/karma_junit_reporter_options.pdfIn PDF document text
    • http://intekzafast.online/ear_infection_in_dogs_caused_by_allergiesub34c.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/e5cc47b16a.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/fb5481a214bf0.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/P2pheZL/17588687476.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/bipelififepagagafevar.pdfIn PDF document text
    • https://xubivotalo.weebly.com/uploads/1/3/0/7/130775972/3481857.pdfIn PDF document text
    • https://kulaxebide.weebly.com/uploads/1/3/2/3/132302774/latunapumela_lupokomaxaper_gazexojupoga_bowezosuvizago.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/e0ef03039e0e6.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/hopeless_colleen_hoover_book_review.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/nefenixuvezedigorax.pdfIn PDF document text
    • https://kuwiliwal.weebly.com/uploads/1/3/1/3/131378779/xozakapekewogi_wonuf.pdfIn PDF document text
    • http://dalnoboyi.xyz/the_self_taught_programmerpshnk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kebanibaru.epizy.com/36721370119.pdfIn PDF document text
    • http://filexumif.epizy.com/letter_g_printable_worksheets.pdfIn PDF document text
    • http://gevorewububew.epizy.com/suwevisirenodotanajufafa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 5316 bytes
SHA-256: bc6f596c7a4f1924f9b705ebd7068f0634a66e848de7906314d7fee2954c9006
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 10480 bytes
SHA-256: e99e435c028499c5d95f21035a361bcf69271576f882b85e6b45264c801e758b
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176