Malicious PDF — malware analysis report

Static analysis result for SHA-256 473125b4f79296a2…

MALICIOUS

PDF

78.8 KB Created: 2021-03-16 16:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b5b2125a5d5a27fc6dcfee72d7105a25 SHA-1: d4b8b50b87798476ced795afb09f9f9d0327ab28 SHA-256: 473125b4f79296a224b21d545ee25e41b52e036cb5209151582b78bb2e2e698b
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites.

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://zajinet.ru/123?utm_term=braun+multipractic+280+food+processor+manual PDF link annotation
    • http://vifaborabab.22web.org/7722275494.pdfIn PDF document text
    • http://reduslim-officialsite.site/garmin_gpsmap_76csx_maps_downloadi20my.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/gediwekoxiri.pdfIn PDF document text
    • http://barberking.best/fluke_561_service_manual5lat4.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/camelot_unchained_beta.pdfIn PDF document text
    • http://islandlandscapesbb.com/59747489373992tt.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/suffixes_noun_verb_adjective_adverb.pdfIn PDF document text
    • http://vosalax.22web.org/free_joomla_education_website_templates.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/46678390214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xipakugamuweren.rf.gd/59465008104.pdfIn PDF document text
    • http://kalogoraretupo.epizy.com/kamado_tanjiro_no_uta_piano_sheet_theishter.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/la_bibliothcaire_gudule_gratuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72039853-30ff-42bb-a516-130b46d8f230/gedemozawagezap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7ea874-a876-43c3-a57b-adc6bfbe9fb2/38478300799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5afec20-371b-4bc4-aee8-d23b94a80d0f/ponogagijakojelanugedajew.pdfIn PDF document text
    • http://xovuxeke.epizy.com/wordly_wise_book_8_lesson_13_answer_key.pdfIn PDF document text
    • http://ramapenutizawa.epizy.com/does_artemis_fowl_fall_in_love_with_holly.pdfIn PDF document text
    • http://rixupod.rf.gd/algorithm_design_manual_kindle.pdfIn PDF document text
    • http://disozisujenat.epizy.com/we_apologize_for_the_inconvenience_hitchhikers_guide.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_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 5820 bytes
SHA-256: 57cdcd76bba7d92b6dc4bcd06c5e73d891829bbb04889e46ca338289e567d055
font_01_sfnt_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 10880 bytes
SHA-256: fbe262834354d43be78b12e377e3368ca02a859e2ecdbe3e9803ca518338ae3d

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