Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a3bcde09ad8dab…

MALICIOUS

PDF

66.8 KB Created: 2021-03-21 01:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9877c720ece6ccc71e8c769762378a23 SHA-1: de4c85d51c61a93ce1a4d4c9272b1d4715f21e53 SHA-256: 39a3bcde09ad8dabd5f5ea7159571d2ea35a471a2351eb9c454c1b00c7cbe93f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xajibur.ru/wix?keyword=mid+chapter+checkpoint+answers+grade+4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409623/normal_5fdec9d253d13.pdfIn PDF document text
    • http://zajilakofudo.scienceontheweb.net/tetelevinotevabowoj.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/18212563201.pdfIn PDF document text
    • http://copyrighthelpcentral.com/bazegomasepaswkdg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_600d6f2a13641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470825/normal_5fde8ac221e3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501233/normal_5fdf111d793d9.pdfIn PDF document text
    • http://santand-es.com/cuisinart_toaster_oven_air_fryer_accessories6o9c0.pdfIn PDF document text
    • http://fruitnaturs.space/58329264126gelms.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/chacun_sa_route_paroles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496577/normal_5fe7edbb45638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_60567ff0a5f19.pdfIn PDF document text
    • http://intekzafast.online/wisixixabemamuloxubekogiwywxre.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/social_security_medicare_part_b_employer_form.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/integration_reduction_formula_examples.pdfIn PDF document text
    • http://temolujipu.myartsonline.com/21790785714.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/rafafokoperuto.pdfIn PDF document text
    • http://wovibojo.onlinewebshop.net/dyson_ball_vacuum_losing_suction.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/divine_mercy_chaplet_video_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/indo_acidatama_tbk_annual_report.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_off0000c656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 5552 bytes
SHA-256: efa13215356024caeacb954c2424c7663191df040cdb262420585b8eb914e1b6
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 10580 bytes
SHA-256: 8f72da3a7615fca9997e8f11bccadffaf2484863421b601c1f21fa334c8c11fb

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