Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8fd0389eecc722…

MALICIOUS

PDF

80.9 KB Created: 2021-06-13 21:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: caad0e095f707b48580e41b3a1b3c642 SHA-1: 288ba98305e5a319210f201767c7f17e04a6bf35 SHA-256: 1b8fd0389eecc7225bbf9279c3c39c602f05e7a1bea3012a74c03c25ced56cdd
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/pbw?utm_term=hausa+worship+songs+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449622/normal_603e09eba658e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd1f3e2a2ef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_60610abe689a8.pdfIn PDF document text
    • https://kuzasafeg.weebly.com/uploads/1/3/4/5/134586407/masimarexowusi.pdfIn PDF document text
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/monofiragofota.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5ff71860214e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_605fef2e67c3a.pdfIn PDF document text
    • https://bijupodenu.weebly.com/uploads/1/3/4/8/134894051/mimapivejakoneg-labawuxikedajom-perajopazoso.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/fdf0292b5bab63.pdfIn PDF document text
    • https://pewidujatiw.weebly.com/uploads/1/3/1/3/131381722/bimubos.pdfIn PDF document text
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/bf5e456a9e.pdfIn PDF document text
    • https://xunatopek.weebly.com/uploads/1/3/2/7/132710497/3006085.pdfIn PDF document text
    • https://pagopolekabob.weebly.com/uploads/1/3/4/3/134305888/3038c8aee3052b8.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/14fe533d-b815-445b-b4af-4afb43a7abf4/dovagefufunilor.pdfIn PDF document text
    • http://kobowal.pbworks.com/f/convert_mp4_to_3gp_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c138a90c-b965-4f7b-87bf-f500d02b369b/seziremozesuperumef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246f795c-64e7-4c6d-a68b-2af9841f5435/33030469363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374f9a14-e5ac-466f-88bf-91c30d8b6e27/verizon_fios_remote_not_working_properly.pdfIn PDF document text
    • http://dimutojopog.pbworks.com/w/file/fetch/144445110/sanam_teri_kasam_mp3_song_downloadming.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144920337/57669904819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/403a617c-2fa5-4abf-9a2d-e869d81669df/dyson_ball_vacuum_losing_suction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ddd8d1e-4593-470d-b3c5-a6cc7378495d/legularabivudejirawulud.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_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 5376 bytes
SHA-256: 127baee40d4865e2f55fb6e068e45580b18f9a4759ab63d410bd090fb4976bf3
font_01_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 11540 bytes
SHA-256: c03882df405d641d857c6e8f324119b6f3028570c97b4b04631e432ead81e187