Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2a5576e95102b4…

MALICIOUS

PDF

80.8 KB Created: 2021-06-08 01:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f04fd0da1a6f313584f6dc148764d251 SHA-1: e9c4db2cf2e44f04cb6ef4882c85c5c3a6675b22 SHA-256: aa2a5576e95102b40317e37d23a07dc5d0fa93c111a3d5ce5ed6b2e53933e501
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting it functions as a link farm or SEO spam, directing users to potentially malicious websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a strong intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://laborke.ru/pbw?utm_term=frequency+table+worksheet+7th+grade+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5ffa05258d1a8.pdfIn PDF document text
    • https://buzolemego.weebly.com/uploads/1/3/5/3/135393469/ce855dcdfdd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_604e756e6746e.pdfIn PDF document text
    • https://tegotaxuwore.weebly.com/uploads/1/3/2/7/132712324/nojivakunalen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_6011e2cb726d4.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/5ca144d3-f5a0-4eec-8c51-a3017e2af37d/putogevuxemewigunaput.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144420204/baby_corn_snake_feeding_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2445c823-7da0-46cc-b3f4-dfe3a59ecc94/68358985849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81bc371b-8017-4c62-96a4-54726bd1ddad/57889553385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8442ca03-ba6e-4b31-8d53-7b2de3c34221/93335726366.pdfIn PDF document text
    • http://daridameku.pbworks.com/f/95778632643.pdfIn PDF document text
    • http://mopevot.pbworks.com/w/file/fetch/144821961/juseledupugu.pdfIn PDF document text
    • http://bikopatepo.pbworks.com/w/file/fetch/144820791/ds_261_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256273bc-3bfe-4827-9400-d4dc816691f7/i_write_what_you_feel_quotes.pdfIn PDF document text
    • http://nugurafuge.pbworks.com/w/file/fetch/144697848/biografia_de_oso_panda.pdfIn PDF document text
    • http://vejivab.pbworks.com/f/how_to_transfer_to_kindle_wirelessly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a1d4c9-22a0-45ca-9929-5a5791bac02d/how_long_should_my_thread_be_for_friendship_bracelet.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144436482/43715869180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b796eea0-5f2c-48b2-b13c-73f35f6836e4/furojemixejirizulig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b9f4be-4473-4195-bdc9-2d4b24bd0588/novo_comentrio_bblico_contemporneo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6077c090-5d4d-4b4e-92d2-b5c39776c6c0/21626322448.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_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 5976 bytes
SHA-256: 9bd89a4b1f9718e9f606984d2eb0babeb65665743e731a40765dc116fc5ea23d
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 11800 bytes
SHA-256: c87d72e44b422c34a145edf1bad1b0e2e25940231087fe105f26a4049f0d6bba