Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe1497a41d8e2f4…

MALICIOUS

PDF

84.6 KB Created: 2021-03-01 23:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c49dbdb8ba4b98ceb6bff164a234478a SHA-1: d6ffff4069170efd938ee905017f6dc29e99b479 SHA-256: bfe1497a41d8e2f44177724db0a241609790ffc2a4a5f6b4f7897fcb80ba58e4
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain ('nipisod.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=identidades+trigonometricas+ejercicios+resueltos+faciles PDF link annotation
    • https://cdn.sqhk.co/nowavutu/hchhMMz/atomic_oxygen_molecular_weight.pdfIn PDF document text
    • http://itclick.pro/740913880966isas.pdfIn PDF document text
    • http://uniques.space/las_hijas_de_eva_y_lilith_libro9pa6d.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/CgiMr01/kefivinofemigut.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/UjbQhhv/flight_foil_boards_hawaii.pdfIn PDF document text
    • http://health-top.ru/tovekivem30j1g.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/VEHgeif/98139795849.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/how_does_the_ability_to_interpret_the_constitution_limit_congressional.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/hbjbvjh/57184021247.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/jjghgVG/xusivutoguderojukiz.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/25207489182.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/geUrUic/xozisazifurasitojokuji.pdfIn PDF document text
    • http://shopyou.online/amar_chitra_katha_google_driver49gx.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/foxegajokumalakutirijuni.pdfIn PDF document text
    • http://devicesprotectionforusers.site/complex_migraine_news_reporterjgvhx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/riwiziziwivarukobividu.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/livingston_paps_fax_cover_sheet.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/nietzsche_the_gay_science.pdfIn PDF document text
    • http://lafagelupuf.myartsonline.com/value_of_higher_education_in_india_essay.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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 5356 bytes
SHA-256: 0dd6323d85a92bfc55cf41d9b8e266164fe10a4c8a941095ffeb85e101320014
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 13876 bytes
SHA-256: 5fef14479e0207516020e95101df1e0c2d03d23753ce65d03dfe72b0f242263b
font_02_sfnt_off00012d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 16132 bytes
SHA-256: 43e84046d57c5d8edad47de9228ce36feb53c5e515436c294a71041590f3a3a6

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