Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b4e7fb4b963e60…

MALICIOUS

PDF

80.4 KB Created: 2021-03-28 04:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ddf74e4fc237ef5473e76a6666bcd40e SHA-1: cb61d208cf7e3f5f175b6794029ac7c94c38014c SHA-256: 67b4e7fb4b963e60ce095110c18c756a0f29575af88b39727bc4d0340fdeb2bc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=tinkle+pdf+online PDF link annotation
    • http://suzofovolavuk.scienceontheweb.net/factoring_polynomials_worksheets.pdfIn PDF document text
    • http://hdvideo.design/fisher_scientific_isotemp_oven_model_650gnsyiv.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/fashion_nova_white_formal_dresses.pdfIn PDF document text
    • http://byt-upak.ru/hp_deskjet_2132_scanner_software8x6og.pdfIn PDF document text
    • http://sizegivip.22web.org/recipe_peanut_butter_sheet_cake.pdfIn PDF document text
    • http://busotokebos.iblogger.org/74133413827.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/996910677255gj7n.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/how_many_branches_of_burger_king_in_the_philippines.pdfIn PDF document text
    • http://xefopuro.mypressonline.com/albizia_gummifera.pdfIn PDF document text
    • http://gamedv.design/watch_the_collector_2004lwehj.pdfIn PDF document text
    • http://xonufokavowitiz.iblogger.org/head_first_solid_principles.pdfIn PDF document text
    • http://bonapimum.iblogger.org/50379791470.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/7d4d5e8f-7b83-438e-81ec-007d946bca9c/pivufaluj.pdfIn PDF document text
    • http://kofadokajofej.epizy.com/masterbuilt_adventure_series_mps_330g_thermotemp_propane_smoker_reviews.pdfIn PDF document text
    • http://kirizureme.rf.gd/jazeg.pdfIn PDF document text
    • http://gazonenewotife.epizy.com/1712105781.pdfIn PDF document text
    • http://wagopof.epizy.com/sozegawupenojafodadoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6bd757-7fdb-4314-9c1b-0a1642087708/tonurejawipana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea9159fe-9f2b-489c-bbc4-274716b3821f/how_to_do_big_7_division.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/jozagajima.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 4564 bytes
SHA-256: c7a6f63abb927a9cb19f603523c9dea00d7419d33bc23e2e4e95a21f20835930
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 11300 bytes
SHA-256: f922aa3e433e463097ab87dfeb59740c7221e6dbb2b3027bc9b6ecbbb235b37a
font_02_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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