Malicious PDF — malware analysis report

Static analysis result for SHA-256 f218b9a67ccb7abf…

MALICIOUS

PDF

77.7 KB Created: 2021-06-06 19:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1083cf6fced5adde9676fa39b18ca067 SHA-1: 21b1dd9f0edc52dd06931920d18cc2f2e016643c SHA-256: f218b9a67ccb7abf3b3a0d83f8b6ebb690d3e2bc21c719bb16eafbe77a590324
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/pbw?utm_term=why+is+my+vape+pen+blinking+3+times PDF link annotation
    • https://zewelujipe.weebly.com/uploads/1/3/4/8/134846298/bogon.pdfIn PDF document text
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/fasumotetojosiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496582/normal_5fcdabc99d1e2.pdfIn PDF document text
    • https://jasenumuruj.weebly.com/uploads/1/3/5/3/135309327/50f9a9d37.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/5257893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_6019ba9168980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_600f78b0d3096.pdfIn PDF document text
    • https://vadewaxuwarivi.weebly.com/uploads/1/3/7/5/137511132/593c885cd0daf.pdfIn PDF document text
    • https://lexodedibipi.weebly.com/uploads/1/3/4/6/134683920/16018de2f56007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481278/normal_602ba2a57dde2.pdfIn PDF document text
    • https://kulaxebide.weebly.com/uploads/1/3/2/3/132302774/sifapizidawo-lajuwewudolasi-zibifi-nimewofareb.pdfIn PDF document text
    • https://delaludesepomaz.weebly.com/uploads/1/3/4/0/134096679/bagan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_60bb075553e23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fc5b5ab4f7e2.pdfIn PDF document text
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/fijulorufelogoxesufi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5febcfaa9de96.pdfIn PDF document text
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/xewuz_wuzaf.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/fd116337-a560-43d8-a799-14cc47457dc5/39778835964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb46fde-dbe8-48be-90ca-879cba170de9/tomasazesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b18a8d-2f0e-49fb-9844-5419998c5df2/38313406489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82fffdaf-0843-42d0-baff-6b430a0825a8/how_to_use_a_singing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb240ce7-c7c7-452b-9a6e-4d2523ab1fc0/maze_runner_movie_plot_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f05fea7-db76-4feb-9ef3-4d91b521dbbe/common_core_english_worksheets_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5363738-a231-4207-a0f6-92c75aeac58c/how_to_set_timex_expedition_indiglo_digital_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a8964c-fa3b-471d-b916-3ed083438b82/filozunidax.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_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 5680 bytes
SHA-256: 32965705e1a354ce49b1f83fc05d8e386cd15aa5602731e5b86009098e4c0728
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 10504 bytes
SHA-256: a90f1583e6e287b7c67da4a03e52a21e8c7247d2cdfb0a3776c61fae8eab693e