Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8e6ff77e534488…

MALICIOUS

PDF

82.5 KB Created: 2021-03-10 04:59:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e8688ac2e1d0330e9fc34d45b72f2e1f SHA-1: 9762ac5edb444a39c8b908f7b3a348004b888a79 SHA-256: 2c8e6ff77e5344882718d959214f5273543701b5ceeaff961aeeba4f098d2b4d
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 0.9993

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://bologen.ru/aws?utm_term=cissp+all-in-one+exam+guide PDF link annotation
    • http://niwadeg.mywebcommunity.org/fawifujidasele.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/5226046.pdfIn PDF document text
    • http://dikagowoxi.sportsontheweb.net/mext_scholarship_research_proposal_sample.pdfIn PDF document text
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/c6608.pdfIn PDF document text
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/mezamuwuwadozuf.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/bonamifatodazel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_60014e2518016.pdfIn PDF document text
    • http://tenipimutav.mywebcommunity.org/gokasid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450516/normal_5fc7d30594497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_6023c8d29651d.pdfIn PDF document text
    • http://bevurib.22web.org/mathematics_puzzle_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465935/normal_604816c7135d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5fcb4ecbdc8c4.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/ff93a16e-1264-4ada-823b-6dc7989950f0/free_spanish_dictionary_app_for_iphone.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_7ba88d3e147a4f5988262cb66945cea9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40b7510-9586-41f8-8237-d35655832ec2/fender_mustang_2_40_watt_manual.pdfIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_a9ccb735f74e49b2b6b9d2c5d1b2dbc9.pdf?index=trueIn PDF document text
    • http://nomapalugaji.epizy.com/nazikoboture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d0b25c-3842-431b-a8f9-e8e4e5d0d156/jipivipebitunevosibiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c571bb-711d-4981-a42f-3836384555c9/vesejovofijuninifizal.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_298ed827a8ae479b9e3afd01604010f1.pdf?index=trueIn PDF document text
    • http://bivojeda.atwebpages.com/how_to_fix_a_printhead_problem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb82f22d-42e2-4513-b1df-656ff49d3664/dowofozupax.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_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 5188 bytes
SHA-256: 071374794f9bdde502fe71e1d2aad6785aff0b3b960730d289ce6f33cb0a5d35
font_01_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 11552 bytes
SHA-256: 031bdd9b3bd6ac76813e4580d02220ea03defb48ea77bb5b00517334f1724912