Malicious PDF — malware analysis report

Static analysis result for SHA-256 d841d0a4bbdd1d5f…

MALICIOUS

PDF

109.0 KB Created: 2021-03-28 04:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f31ca27ac72af3b089f472f72c9d3f1a SHA-1: d9bbc9d2a57074dc47f44ce9acf6b047a89acc7d SHA-256: d841d0a4bbdd1d5f444432104906c1499eab14a4001b7edb0701d47d0df97a0a
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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.
  • 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://mezovuduw.ru/strik?utm_term=sketchup+vray+tutorial+pdf+free+download PDF link annotation
    • http://lipexifinidoda.scienceontheweb.net/how_to_connect_altec_lansing_speaker_ima699.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/norton_anthology_of_american_literature_8th_edition_free.pdfIn PDF document text
    • http://buytoday.cc/445403096107ksw4.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/33351783645.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/RU3JtWk/football_killer_bees.pdfIn PDF document text
    • http://keto-s1.com/10538533341pj9bm.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/gdjgGqc/cloudy_pool_water_high_ph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fd26e374c03f.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/NBNrhfL/her_story_game_guide.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/18880215867l77g7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_603598fc46012.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/hxHihie/wutoxuvuzurisudenisugexez.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/line_6_spider_iii_hd75_75w_guitar_amp_headtwyzy.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/fexCIu8/57142350207.pdfIn PDF document text
    • http://juraxoxodas.scienceontheweb.net/69840945318.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/actuators_and_sensors.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/28760906101.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_3545ca20c9bb40f8b26dd64abf89c76f.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_6781e32e1f06475b96e439e89e67f387.pdf?index=trueIn PDF document text
    • http://sovogezo.atwebpages.com/17727405993.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_off00016487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16487 5488 bytes
SHA-256: 909b208a590bd8746d35c98a4e358072adbc98850dafa9dae9510acad5778e29
font_01_sfnt_off00017754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17754 16688 bytes
SHA-256: a47c2ef0b42d519eadd1cbf212474b0068d9a0687a298798b1a9f7938062c370

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