Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2cd7dc828e969b…

MALICIOUS

PDF

73.6 KB Created: 2021-03-14 09:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1851dc7fa8bc753d07ac4e04cf3e31cf SHA-1: 15075d48c3af70f21756c3868d83eda00045e497 SHA-256: 2b2cd7dc828e969b4234fbb5087b099a820cfb598c96f4b0fab89c566aebed37
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 0.9999

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://jumiwimov.ru/award?keyword=el+cerebro+humano+libro+de+trabajo+diamond+pdf PDF link annotation
    • http://pazazilomereli.22web.org/nirupeno.pdfIn PDF document text
    • http://fherixq.com/biomedical_engineering_bridging_medicine_and_technology_free_downloadoapez.pdfIn PDF document text
    • http://ndfnasg.xyz/symbol_scanner_ls4278_programming_barcodesg2wvk.pdfIn PDF document text
    • http://jixaravaxagisuf.22web.org/black_king_starboard_plastic_sheets.pdfIn PDF document text
    • http://stroy-level.ru/mockingjay_book_summary_chapter_by_chaptera6qt0.pdfIn PDF document text
    • http://healthyforczechrepublic.site/valuation_gographie_cm2_se_dplacer639fc.pdfIn PDF document text
    • http://kartaidatodemeleri.com/zapidexodavevzi60v.pdfIn PDF document text
    • http://mstmail.space/is_samurai_champloo_completevmc26.pdfIn PDF document text
    • http://mixit.info/738497444030o5ao.pdfIn PDF document text
    • http://monogawuw.iblogger.org/3553517194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7191fe7-be07-48e1-92fd-406e47779d53/hp_pavilion_all-in-one_-_27-xa0014_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65845b35-700e-4744-9b50-11130221c376/25414315178.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_0c4e78ad18f641a3b512f0873a63499f.pdf?index=trueIn PDF document text
    • http://bedivuloluxamu.rf.gd/lobby_hero_full_script.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_90884cd6391f48d6be1486e4bf74eb41.pdf?index=trueIn PDF document text
    • http://kajelivipusewof.epizy.com/nice_guidelines_neonatal_jaundice_2016.pdfIn PDF document text
    • http://jabukejezari.epizy.com/xutewegadilavosuxigumal.pdfIn PDF document text
    • http://wubulinefoz.rf.gd/jamufesonazamapifek.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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 5388 bytes
SHA-256: c78b0b9addf207df9ae3422812f487c7061e7a79ba520e80874fd61446fa08ad
font_01_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 12448 bytes
SHA-256: 068336114ef6eff9bb09f1d27592a20ca4bf8c91a19adc8a3e2289dff6040176

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