Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d724ed06b99500…

MALICIOUS

PDF

79.5 KB Created: 2021-04-06 05:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8d71d3d5dbd4c46d2c0abbba069b5d75 SHA-1: 2087f0a07ea470abad8c76b88e146d221bf44a52 SHA-256: 51d724ed06b99500a7cfa078914d2cccac5d9518f3003a4dc5a10baffa351b8d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

This PDF file contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm or phishing campaign. The primary malicious URL identified is https://baarspo.ru/strik, which is likely used to redirect users to a malicious site or download a payload. The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=honeywell+mm14chcs+drain PDF link annotation
    • http://zanodopowe.sportsontheweb.net/mpc_essentials_no_sound.pdfIn PDF document text
    • https://gudagomafefaxer.weebly.com/uploads/1/3/4/5/134523608/337475.pdfIn PDF document text
    • https://kewejoxenolubur.weebly.com/uploads/1/3/5/9/135966954/f749e9baa23.pdfIn PDF document text
    • https://kafowuvipuv.weebly.com/uploads/1/3/4/3/134337110/4121688.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/94739232064.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/gimun_vanozorudizig_zezomomixavo.pdfIn PDF document text
    • http://bexemusu.mypressonline.com/les_boloss_des_belles_lettres.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/9410817.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/747af210-d61a-4488-9af8-6b77449a4ba5/sony_wh-1000xm2_wireless_noise_cancelling_headphones_review.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/tusape.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/wisagikexuxalulafiwarag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48798cb9-8486-47a8-9cea-df976c88c6ea/seledirupog.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/thank_you_maam_story_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/2975252719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea763cec-0376-4c79-9354-9a3c335daedc/la_ciudad_y_los_perros_resumen_corto_yahoo.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/3d_touch_android_phones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd56d3b-0c9d-4299-a0e6-75a1d6c50bc6/85533630138.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/6986829255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a28c92a-820e-44a9-9ddb-55d95037ea7f/50765755757.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/iso_9001_bureau_veritas_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/76913704821.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_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 5476 bytes
SHA-256: 92ec1e5395f6f8924ee68ca4069d0ec87c46c64fc8fe57e495518b01d2c0bc2e
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 11772 bytes
SHA-256: ed1ea97b71482f3c22fa0d23a526c96daf8dc21a4d84a1c2a1eb177fa852290f