Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0c3b2c324d424b…

MALICIOUS

PDF

74.3 KB Created: 2021-05-28 09:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 048d29f361515cf1436f3e106dad2fae SHA-1: 2818886eae59d2552e9b882b1efcb0cb459ccc73 SHA-256: ce0c3b2c324d424bed5f63752895906a355a0b07be342d12edec4d423246737c
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=fractions+to+decimals+to+percents+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457318/normal_6015e1c475eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_600a0de306965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_6022928725ee2.pdfIn PDF document text
    • https://teribizekejuxes.weebly.com/uploads/1/3/5/3/135391999/jibuk_buvobofonole_lizaguzofono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_601be6e289a46.pdfIn PDF document text
    • https://ximixejolulozo.weebly.com/uploads/1/3/4/3/134351986/02059.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/zawolijadumati.pdfIn PDF document text
    • https://wenajatimox.weebly.com/uploads/1/3/4/4/134480159/2459719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_606ba6655c3ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_6065c1cbbd9ea.pdfIn PDF document text
    • https://wagetuve.weebly.com/uploads/1/3/5/3/135323282/morefo.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/2110392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390068/normal_5fc5d7258c2c8.pdfIn PDF document text
    • https://moxujudafetofa.weebly.com/uploads/1/3/2/7/132712376/zufogonowos.pdfIn PDF document text
    • https://lurufakezudaka.weebly.com/uploads/1/3/4/8/134884294/3184693.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378856/normal_5fca68083f5ad.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/55af46a6-ce2a-451c-8859-023b151c5094/39833462672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eaadf44-9322-469c-9ff1-ddd20b71b45c/44753767620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b01943-82e7-48d8-9b7d-7d32cf7eb320/how_to_pass_pre_employment_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0852e7d-f2d6-4121-a3f3-006a5ea865b5/what_books_should_my_8_year_old_be_reading.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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 5424 bytes
SHA-256: 97a129d5f206d6beb2335f974c5c03a83a828ff884a96facd51b8da69643e137
font_01_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 10696 bytes
SHA-256: e33f4e013379f3f1e2e66bd7ef2dbe79cd64dc426e2af1e38eaa690c6054d3c9