Malicious PDF — malware analysis report

Static analysis result for SHA-256 78730331b16b6976…

MALICIOUS

PDF

76.1 KB Created: 2021-06-11 14:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6b982d6e29379be88f9aa1b30bf0bb0f SHA-1: ca72fcf96e82fd77562aa44cc557aab8a445b333 SHA-256: 78730331b16b6976419b2ad584ff537baae6f9565de9bc1c30ee020f8243a36e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/pbw?utm_term=omegle+stranger+chat+video PDF link annotation
    • https://domenotupeloli.weebly.com/uploads/1/3/4/6/134685365/e16577e431a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461744/normal_5fefca5ba5956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_60476a36239c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5fd163e969e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_602d9ccfad833.pdfIn PDF document text
    • https://daxatuvumuna.weebly.com/uploads/1/3/4/8/134863787/9253544.pdfIn PDF document text
    • https://tafajasezo.weebly.com/uploads/1/3/4/3/134312542/guded.pdfIn PDF document text
    • https://bujegeti.weebly.com/uploads/1/3/4/3/134355457/d39bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5fe0d2aada76d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450145/normal_60636d3b698fa.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/dukurevoro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuwiwaweber.pbworks.com/f/19739177127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e841035-4164-4e02-a2ed-b19145401c60/94439540911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39dc72da-402e-4cd6-9f79-d9bf49d2e0f2/best_norse_mythology_books_for_beginners.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144626640/how_to_use_the_solar_power_bank.pdfIn PDF document text
    • http://goferupemo.pbworks.com/w/file/fetch/144628182/melemejesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8ba91d-56bd-4128-911d-f427f0bdde3d/piboruxurividoxuwejemew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/400c2255-f920-48ea-8bb3-cfe4da52c3d7/44233205093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40197e4-af29-4fc2-b373-4e0691ecc66f/zewejagemazirapa.pdfIn PDF document text
    • http://raravisu.pbworks.com/w/file/fetch/144790626/what_to_study_for_georgia_permit_test.pdfIn PDF document text
    • http://lipadune.pbworks.com/w/file/fetch/144414870/what_is_the_correct_order_to_see_marvel_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e7c3b4-6b40-4fb4-a1c1-3a524078dfbb/vobofutazonitukufoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7447f4d-3024-4da7-83cd-2c7d4b5e9050/front_end_estimation_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499a04f6-fda2-4d70-b961-b1f4b425c868/evaluacion_diagnostica_grupal_preescolar_2_grado.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_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 5440 bytes
SHA-256: 7c4b3966c31c5837af471f476cd1bef491fcdcbd698408fc3d5e2803d13f3905
font_01_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 10972 bytes
SHA-256: 98dc32fde07fab779f2adb0f3335976fe0b8972e266ada0e03c3837db5651456