Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cc1ea0e87b5fae…

MALICIOUS

PDF

75.7 KB Created: 2021-05-21 04:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d6cbe44e1a309ab29324eb50fe94ffb2 SHA-1: c806405f03ac18bd7a20727677a5fea8af092fca SHA-256: f0cc1ea0e87b5fae02cf0fd78183a66ffff6603ade8534f2485a6a36efc719dc
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to redirectors, indicating a link farm or phishing attempt. The primary redirector URL is `https://dugedepap.ru/strik?utm_term=barcelona+vs+real+madrid+2017+games`, which is likely used to funnel victims to a malicious site. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=barcelona+vs+real+madrid+2017+games PDF link annotation
    • https://vevavosabiwebe.weebly.com/uploads/1/3/4/3/134349804/sabupagadadiwa.pdfIn PDF document text
    • https://tojumemi.weebly.com/uploads/1/3/1/3/131379390/piveselapabinaw.pdfIn PDF document text
    • https://dizasufe.weebly.com/uploads/1/3/4/6/134680143/mavolelixepuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_6054ece837cfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_5fd9d96be0099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_6009cae00b88e.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/sumuji-metavobefepab.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/sulasatevirexo/cs_lewis_religious_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/the_family_crucible_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/54898687189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a03088-f640-42da-9242-2d31561615b9/jevelimekipisududibinafa.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/nadojuliwolesivi.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/momupedotugumuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/tinixegibusesikarogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c78f4f3-f8ee-4be7-8703-b063877ae693/bujepitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08a9623-fa24-4347-98a9-6b72d4b80a4b/74723388123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2470795-5c41-4c33-be84-3d3c7bf1a78b/clark_forklift_suppliers_in_uae.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/rocking_horse_nursery_carleton_ofsted_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f4ea55-abbe-4889-98e1-3392cbf82c3e/oracion_al_espiritu_santo_para_sanar_la_mente.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32bd148-6c90-42b3-b8a1-e42608718139/bijedufixobomiwiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf241e3-f95d-4d1c-96d7-5f8b72559f0d/39177472038.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_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 5772 bytes
SHA-256: 144813a6c68140a70013f6ab9c1cfaf088e46ee2925e5437e46aa5fb713b0a3f
font_01_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 10208 bytes
SHA-256: ae229d985f0dd1fbb9d98e3c7cd6444d2d0f7fbe0bd04d915c2a94e60b445c02