Malicious PDF — malware analysis report

Static analysis result for SHA-256 8259e3887c3752b0…

MALICIOUS

PDF

75.5 KB Created: 2021-06-02 10:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 00f0feafed7b49147b7b7103b90e3f49 SHA-1: d40b3c0ffd94cd8c6dca3c7ac33069fc37d0ad61 SHA-256: 8259e3887c3752b03dfba8a964dd54f8d3998bc1f2e1c6f63d0e035abdf2204c
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/pbw?utm_term=what+is+x%252Fr+ratio+of+transformer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384459/normal_5fe5974514d9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5ffd33f937b3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496571/normal_5fd7d535d97da.pdfIn PDF document text
    • https://woluxivevarot.weebly.com/uploads/1/3/4/6/134672831/3992462.pdfIn PDF document text
    • https://rabibenexu.weebly.com/uploads/1/3/5/3/135319922/koxipipagekip.pdfIn PDF document text
    • https://moginirem.weebly.com/uploads/1/3/4/7/134769545/mevowomabogamin_sesogofosu_sufifagu_tijepozosisozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_605f57607e330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_606cc36d57e46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5fc5a9cb61ff6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4476765/normal_60b341ca1c8ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_60602af69f1c7.pdfIn PDF document text
    • https://venujavuzuzejo.weebly.com/uploads/1/3/0/8/130874514/2ebbb9a1e0b3885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_604d0351d5afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391340/normal_6068ae1939d51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480595/normal_60010fe8209ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_605fa51458c29.pdfIn PDF document text
    • https://tiritezolodimim.weebly.com/uploads/1/3/4/7/134743729/beb90ed51e3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4499633/normal_60b2a82ccd858.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/7e7d376a-bc1a-4819-8e7a-23dc846d69b0/16395689328.pdfIn PDF document text
    • http://lomubel.pbworks.com/w/file/fetch/144495990/crows_zero_2_full_movie_sub_indo_lk21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef405c62-96ad-4bec-bc09-dd4b65f12ee7/36283146952.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/strike_force_mod_apk_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b2edf4-eb4b-4d4d-914e-cb644cf67530/47497080644.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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 5092 bytes
SHA-256: 5e6a94f237d8d2b5ee4873f86b51748f9a20e7001de695d11b86e9663acba549
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 11688 bytes
SHA-256: 1d48176ec2fda31a29baa755e3359de569e508bde2a5831d8538ac6c2ad17171