Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcb9de15f647b37…

MALICIOUS

PDF

80.2 KB Created: 2021-04-08 10:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3a80418e9c6191095ec8b7a45c8067af SHA-1: 6116bd00384864578b8c46dad11352fe29bb860b SHA-256: bfcb9de15f647b37094464e8409df3e431e3eca9a9d76bf47cc52a78171718af
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to leverage web content for malicious purposes.

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.
  • 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://midufefew.ru/strik?utm_term=how+to+set+time+on+rca+usb+charging+clock+radio PDF link annotation
    • https://cdn.sqhk.co/noluxokeruma/hcrMu4c/carbene_reaction_mechanism.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/Y53VwoM/voxep.pdfIn PDF document text
    • http://wejaduz.mypressonline.com/wuwexu.pdfIn PDF document text
    • http://zafenoro.scienceontheweb.net/new_directions_in_spatial_econometrics.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/around_the_world_in_80_days_book.pdfIn PDF document text
    • http://virona.org/best_rated_18_cubic_foot_refrigerator9ajx8.pdfIn PDF document text
    • http://afracheat8.xyz/297202107573bfyl.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/agmHQkq/play_4_night_game.pdfIn PDF document text
    • http://prostotit.site/payday_lending_credit_reportinglloy3.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/anSFjhr/boxing_star_apk_mod_1._6._1.pdfIn PDF document text
    • http://50offshop.pro/82388512006wxo0x.pdfIn PDF document text
    • http://volalagokiva.sportsontheweb.net/daratuvudi.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/hjiFheq/cnc_machinist_near_me.pdfIn PDF document text
    • http://megatorg.ru/836424706343vpcp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juborekif.atwebpages.com/modelo_de_intervencion_psicosocial_en_trabajo_social.pdfIn PDF document text
    • http://wukevivetarapu.myartsonline.com/latent_autoimmune_diabetes_in_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519b6d85-4fe2-4349-993d-8255f3a65460/how_to_write_a_really_good_rap_song_in_30_seconds.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_ac66e4eaafa240f98a25ca3a4880f9fc.pdf?index=trueIn PDF document text
    • https://2df7536a-ab64-4dd3-a6ca-98e0eca144a4.filesusr.com/ugd/de578f_0ef1f064154641d9bf130e89eace3d7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42720c6-5aa3-4683-81d0-c75e232ca71f/4439220500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106651d6-5e31-430b-aa30-bf21852a3f4e/pirerovusugimoximula.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_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 5612 bytes
SHA-256: 6db6d7a97f77c2ef0baa9178f44041460e53d910b540e6e28f07223c0c2018e2
font_01_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 10928 bytes
SHA-256: 6442d3655694e26dd7bb57c712c20d5c6a009886cdaa3d9fa319a72d2a0a9040