Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd039a8d8bbdbcd4…

MALICIOUS

PDF

86.1 KB Created: 2021-02-27 20:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8736a7be510ade7e8da3db350ab35dc7 SHA-1: b5890bb216a28ddb9ce8af9132a4b5a1064b0f1b SHA-256: fd039a8d8bbdbcd4b07b01b7cf8b4ec39fc3405136e0bba689502230db43b2cd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, with at least one heuristic identifying it as a link farm on disposable hosting. The presence of external URIs and the overall detection suggest the PDF is used to redirect users to potentially malicious content or phishing pages.

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://dugedepap.ru/123?utm_term=the+light+fantastic+quotes PDF link annotation
    • http://lojapidabud.mypressonline.com/how_do_you_share_a_video_on_facebook_story.pdfIn PDF document text
    • http://trysoda.pro/54771469163pxqqr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5fd1052ed8b92.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/domukatigu.pdfIn PDF document text
    • http://jirafka.space/37486738937izo5i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457582/normal_5ffcd30a7c79a.pdfIn PDF document text
    • http://antinomi.design/can_a_three_phase_generator_be_converted_to_single_phase333pn.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/read_the_excerpt_from_ralph_waldo_emersons_self_reliance_these_are_the_voices.pdfIn PDF document text
    • http://rodsfish.club/jipasiwivepekevaxtl4q4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482009/normal_602949766935e.pdfIn PDF document text
    • http://storeeuro.info/773465987031g93l.pdfIn PDF document text
    • http://madamzero.com/wudadibifavo7rnj1.pdfIn PDF document text
    • http://top-salez.site/jezotuarl5s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jupilabezisetif.epizy.com/8640123313.pdfIn PDF document text
    • http://novosumagib.epizy.com/interior_design_portfolio_layout_templates.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/ethical_hacking_tutorial_free.pdfIn PDF document text
    • http://konugatevokaxot.epizy.com/powerpoint_presentation_medical_templates_free.pdfIn PDF document text
    • http://forevar.rf.gd/6413765449.pdfIn PDF document text
    • http://molamizaxe.epizy.com/aambala_video_songs_masstamilan.pdfIn PDF document text
    • http://kovefevejafuk.epizy.com/what_does_a_flammable_cabinet_door_replacement.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000132ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x132CE 17048 bytes
SHA-256: 6cd91f416807611a1d00883b8f331fa4b2978edf3ae52f6f4accdf4e052a4eef
font_00_sfnt_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 5124 bytes
SHA-256: 2c05ac04b0078a632d1bbc2c0dc8ad9b3eeac9f3b0183bfb1f20cb8cdf8e16b6
font_01_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 10440 bytes
SHA-256: 14eb66d8ae2eeea61d5881ba5470035759f8187b4a8a7049ea8299cfbfdb8678

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