Malicious PDF — malware analysis report

Static analysis result for SHA-256 2932857c2c805206…

MALICIOUS

PDF

69.6 KB Created: 2021-06-04 06:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c64b7c83d5c9d502c6ba908be12f5506 SHA-1: d1d74d963c4de5e1875d75a9d12a09a0e09dbbf9 SHA-256: 2932857c2c805206a372642adf6fe1ac71db00ac7344f913f3d254d4a8b5c141
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, https://ketchas.ru/pbw?utm_term=annadata+full+movie+bangla, is likely part of this scheme. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/pbw?utm_term=annadata+full+movie+bangla PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494875/normal_5fda2c5066b8b.pdfIn PDF document text
    • https://rixolojujosu.weebly.com/uploads/1/3/4/6/134622111/1a6ceefe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_60339f93e1715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421039/normal_5ffe6e1129768.pdfIn PDF document text
    • https://wutefojatix.weebly.com/uploads/1/3/4/6/134662353/velubow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japomajuxire.pbworks.com/w/file/fetch/144441741/baixar_pokemon_mega_ruby_para_gba_em_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cdfc172-3350-4e1b-bbea-c88802fdb1cb/mxr_bass_compression_pedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95a700b-2ad3-48ce-9c39-f5f378369ff2/72052299024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0e1bb1-5083-4ba2-a6eb-6a6d91b7f198/tinesafaxul.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/w/file/fetch/144451374/curriculum_ppt_templates_free_download.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/f/what_is_the_meaning_of_actions_speak_louder_than_words_in_malayalam.pdfIn PDF document text
    • http://lerepaxa.pbworks.com/f/how_to_remember_surface_area_and_volume_formulas_class_10.pdfIn PDF document text
    • http://xifatarege.pbworks.com/w/file/fetch/144550170/98728792827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e8dd4f-2fd3-4c10-b224-b2962bf9bd72/mebole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23271f13-db34-4bd6-b6c2-3aa24be3d80f/where_is_the_serial_number_on_a_schwinn_airdyne.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144487686/73462207053.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/w/file/fetch/144512139/wuvexevififidodasobaxux.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 5144 bytes
SHA-256: b402569714eaf8f24f31a23e8672049ea8cefd61b5060adc73cb5ce5e7c73b61
font_01_sfnt_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 3888 bytes
SHA-256: 213b3930a4ed020f0258d48af3b1c573e0f0035721b0fb5f59ddf5e5f8917084
font_02_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 10104 bytes
SHA-256: 8bd507ea6f6413bc2562a0e371981e64f4dde4e7e2b253e45935d4c21f899599