Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11cfb507bccf88e…

MALICIOUS

PDF

78.4 KB Created: 2021-04-04 08:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ab0943fd6ce7cac914653c0f2dc39f9f SHA-1: 243500eacf8aa891f7ac808827d9af4bd15ac549 SHA-256: d11cfb507bccf88ef1d3f5fa61cc69934328c6c3470df362fba5a3629406f27b
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or scam attempt, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to direct users to malicious or deceptive content under the guise of providing free book downloads. The ML classifier and ClamAV detection further support its malicious nature, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/award?keyword=british+english+books+pdf+free+download PDF link annotation
    • http://womans30planet.com/harman_kardon_hk395_schematicc2ln9.pdfIn PDF document text
    • http://csxmoney.info/barnstable_county_probate_and_family_court_formslh97n.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/af8d9860cc8a4b.pdfIn PDF document text
    • http://artistichomesolutions.com/what_einstein_told_his_cook_2esdt4.pdfIn PDF document text
    • http://price-list.moscow/45129624864n5wq2.pdfIn PDF document text
    • http://8gusevshop.website/beyblade_burst_rivals_download_uptodownydfzb.pdfIn PDF document text
    • https://kugudawurero.weebly.com/uploads/1/3/4/3/134383309/730308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_f2c5159078184ac2952c1edc7e4a9921.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godewumazek/61931776664.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/zolusutuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9efa85f5-37ff-41a5-8fa0-263bcece7102/el_coronel_no_tiene_quien_le_escriba_resumen.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_245998fbdf6a4f9dbfccba68772d7b54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemazun/25745537007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c32dbaa-64e7-4736-a29c-7eafcbd9dd4b/tc_electronic_flashback_x4_delay_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322d0ec6-5a7b-4e98-9997-07e156dd4974/the_raven_boys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4d757e-9834-4aa6-8d21-44fa5385d7e0/93402599609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87ca1baf-4871-420d-863f-588baa2ce167/brother_mfc-8480dn_drum_reset.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_71b7d374dfdb4957ba23555a8c270222.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e90970e-d9e9-46ab-a64c-558feb1f142c/eleven_rack_manuale_italiano.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_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 5648 bytes
SHA-256: 06ab9bb20b79d641562815aae6e1c4f4e767472fa2137dc24a029e5016f648a8
font_01_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 10748 bytes
SHA-256: d6e8f60e546bad564da2fdf611fccf6697bf8e987613b47220da27476c56a088