Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e54e2af47ad9f7f…

MALICIOUS

PDF

80.8 KB Created: 2021-05-08 09:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ad7b8856de240be718316daa2a5e7921 SHA-1: 84ff9bab9680dd87ae133b8f95263ddff6078dc7 SHA-256: 3e54e2af47ad9f7ffab1b8cefda9ce7c47daf9b9004d35311b2e9cc06b863900
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. One of the primary URLs, https://botokaw.ru/strik?utm_term=tim+ferriss+podcast+hugh+jackman, appears to be a redirector. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web 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://botokaw.ru/strik?utm_term=tim+ferriss+podcast+hugh+jackman PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421329/normal_604cfedd720c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_603bf8287cba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_60623432239e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_601855b0df2c2.pdfIn PDF document text
    • https://mozepuboxiwagu.weebly.com/uploads/1/3/6/0/136094106/wijibod.pdfIn PDF document text
    • http://qqkaxes.xyz/47261936646ssq3y.pdfIn PDF document text
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/wutovisat.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/e11e6c41.pdfIn PDF document text
    • http://wogigafulokeme.22web.org/79876709977.pdfIn PDF document text
    • http://vvinorama.website/format_sd_card_cyclic_redundancy_checkwuvor.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/5aafb69e-3d89-4f63-8f26-c0a4b908eade/what_is_simple_interest_in_terms_of_economics.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_3ccb70f01d3d48a0b5f010aa3d674927.pdf?index=trueIn PDF document text
    • http://xutakubu.epizy.com/math_facts_practice_worksheets_1st_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ab5c6e-9e34-4063-81c7-241b564b3c78/how_can_calculate_safety_margin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4490be88-8af1-46f1-a9e6-aa2389bb6e49/where_to_buy_lock_pick_set_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef9870c-ff58-411f-a6b5-57f08bb3ea73/ncert_maths_book_class_8_solutions_data_handling.pdfIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_b008f3b563864fffa3a78d5cd6864601.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_a541edc272184cb1a8d9c569572b023a.pdf?index=trueIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_5ec6f4a48950416bafbb07f2eedbe9ec.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 5628 bytes
SHA-256: f6add4881f21d896a49804b6ed01864e1b295eb3e1ecdf2974d29a9499adf55f
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 2344 bytes
SHA-256: 3710f46d2f908ede9c06af5dbb255e08808dbbafc4bec95595eaa4b3b3bd2136
font_02_sfnt_off000110d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 10772 bytes
SHA-256: 62245f31035c4d0b9e5370dc0b8712b3d724e3923c465802c488120f3d0eaf6b