Malicious PDF — malware analysis report

Static analysis result for SHA-256 6345de907430f653…

MALICIOUS

PDF

79.4 KB Created: 2021-06-13 18:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2fe4116147c39858d9571e40aa8e391a SHA-1: 3c24ad4225492c6d829cf053e5156154c43c1474 SHA-256: 6345de907430f653de358c08a40c8353eb7ce200d5cf0f4e5c6254cf27a64854
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to other PDF files, suggesting it functions as a link farm. The primary URL, 'https://laborke.ru/pbw?utm_term=3d+text+effect+photoshop+action+free+download', is likely a lure to attract users, while the other embedded URLs are part of the link farm infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=3d+text+effect+photoshop+action+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5ffbcba021de4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453540/normal_60bf175b716c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408718/normal_5fcf24c25134e.pdfIn PDF document text
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/2fa7a4.pdfIn PDF document text
    • https://saronikevuvu.weebly.com/uploads/1/3/4/4/134460573/44477f391.pdfIn PDF document text
    • https://vulajavup.weebly.com/uploads/1/3/4/6/134683256/tufizozunefuv_fatuxowogepaxu_wipobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_60681e870abe5.pdfIn PDF document text
    • https://xubusiruk.weebly.com/uploads/1/3/4/4/134481781/diguzor-semujodedodu-pefakemop.pdfIn PDF document text
    • https://xinufagepowe.weebly.com/uploads/1/3/4/4/134437511/lopovovebalakan_nudilopigukiw.pdfIn PDF document text
    • https://sopebanodi.weebly.com/uploads/1/3/4/0/134017095/figif.pdfIn PDF document text
    • https://damasidegiked.weebly.com/uploads/1/3/1/4/131411688/1285229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_5fd1b63098937.pdfIn PDF document text
    • https://xuvagava.weebly.com/uploads/1/3/4/8/134879605/wudumatixidowozi.pdfIn PDF document text
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/5516806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dupalalo.pbworks.com/f/3704496302.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144453852/how_to_know_if_tv_backlight_is_broken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4966ae29-1bfb-4c1e-a604-e52e0e0a2bbc/tokeda.pdfIn PDF document text
    • http://vowetegaperi.pbworks.com/f/pefaviserenapejulodojum.pdfIn PDF document text
    • http://xeninexiruvo.pbworks.com/w/file/fetch/145171029/variable_dependent_dan_independent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23b2679-cb9d-4c63-8ef3-36bd146477c6/68898418695.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_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 5472 bytes
SHA-256: 5425bac6db9790fbde2fd01a1f3d8ee4d40398667263a6103a479a7c375fb9b5
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 10776 bytes
SHA-256: aee047c5eadfcfe1eb5d27ee7c79142f95ff9aa2d7eaf0054a86a95eee631513