Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19144a5b4909247…

MALICIOUS

PDF

91.2 KB Created: 2021-05-22 01:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 82ed8468260d8a6eda892c075481dcc9 SHA-1: fd6fd15f043bb661bf1058aeda069622cb463e39 SHA-256: b19144a5b4909247fa87fe780a12c381e151623aa5dd7a57dd528096e51c63b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm heuristic, suggests an attempt to manipulate search engine results or redirect users to malicious sites. The embedded URL and the document's metadata point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=juego+tabu+para+imprimir PDF link annotation
    • https://sosepokapebovi.weebly.com/uploads/1/3/0/8/130814645/nozemajob_rerikale_bomazita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416326/normal_5fe5f1be5121a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_605cabc5c83f1.pdfIn PDF document text
    • https://xexajuxeleseg.weebly.com/uploads/1/3/4/5/134592224/winegokozom-jejexuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_60378fc1ec969.pdfIn PDF document text
    • https://dewumitoj.weebly.com/uploads/1/3/4/3/134342606/2878967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_602efb969206a.pdfIn PDF document text
    • https://xixusumer.weebly.com/uploads/1/3/0/8/130814933/e5a9e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tosego/brevard_county_florida_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/95091648657.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/what_are_some_nonprofit_organizations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c18874e0-f455-4e7d-bb65-634d9ff6f539/estadistica_de_covid_19_en_mexico_hoy.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/migoraruloz.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/xapogegones.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/moment_js_format_hour.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/13992996299.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/john_deere_js63_lawn_mower_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/how_many_companies_listed_on_nyse_and_nasdaq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5977f862-005a-46f6-8546-162398b81c28/venigegeb.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_off0001256e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256E 5060 bytes
SHA-256: fafca743eee381b685787490a53d6ee1f4970ad4c0d2e87373339a5249437bf4
font_01_sfnt_off00013692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13692 12292 bytes
SHA-256: a9f2ccef09fba6982281a25cd3693666579e2a2c4e2c5e9649a1884fe6e1462b

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