Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d8d60788d28948…

MALICIOUS

PDF

75.5 KB Created: 2021-05-02 12:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fa6bffb8b34e0e5ccf041f5e60b1f833 SHA-1: b1a78c3959dc4b24620a92943083d53219a73621 SHA-256: 64d8d60788d28948511ced7842acaf4d3a0bd2314331e42b16ae6cfab523254e
196 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of an SEO link farm designed to redirect users to malicious sites. The primary lure appears to be related to 'audit objectives', but the embedded links, particularly to 'jumiwimov.ru', suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=what+are+the+objectives+of+an+audit PDF link annotation
    • http://zimezobot.getenjoyment.net/44643574322.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/landscape_archeology.pdfIn PDF document text
    • http://letidorega.22web.org/93489218756.pdfIn PDF document text
    • http://daxavepevepa.mypressonline.com/thailand_bts_map.pdfIn PDF document text
    • http://manapuzasupin.sportsontheweb.net/optimism_pessimism_scale.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/17897368050.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/38331330584.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/mutants_and_masterminds_multiattack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_42d2dead1a8f4190b8021b785c273235.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/cuisinart_electric_pressure_cooker_cooking_times.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/immanuel_kant_deontology_categorical_imperative.pdfIn PDF document text
    • http://bowetuxamu.rf.gd/42437541492.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/86020316244.pdfIn PDF document text
    • http://laxizibobi.rf.gd/cancionero_musica_mexicana.pdfIn PDF document text
    • https://5610d23c-e099-485d-ada5-1c5fec8f01b3.filesusr.com/ugd/97e063_7c5618fc25ce43c3add70c2253dd1d6e.pdf?index=trueIn PDF document text
    • http://roporuti.onlinewebshop.net/64521477712.pdfIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_e448c974b30348c49cc07550a04d1780.pdf?index=trueIn PDF document text
    • https://a909b8fe-7c6e-4467-a5b6-92e64a2a5b5d.filesusr.com/ugd/65efca_a40c3557d00445a3a3617555fe32bb4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/another_one_meme_video.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/bezetokarili.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/bisisufosofaxunuwos.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_fb662b0fb6ae4a48b53c76b794c081bb.pdf?index=trueIn PDF document text
    • http://jaluwapuleg.epizy.com/kaxojudugi.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_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 5368 bytes
SHA-256: 88e5cd0356a511dd9cc534d0b04b1fee92fc68d85d67e6006d66adb8dad78555
font_01_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 10436 bytes
SHA-256: 5c4864809f6e98d0db6ca140ad837b69408091659c7cc76524d220d974ebffab

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