Malicious PDF — malware analysis report

Static analysis result for SHA-256 f625f8e7bedcd6c9…

MALICIOUS

PDF

68.5 KB Created: 2020-12-16 11:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2c4f0f44c9395de1549b9a73f2ec2af2 SHA-1: 9d05ef3f8f29204cfb90cea6937686419431bc4d SHA-256: f625f8e7bedcd6c9669d07208ed766681f6f3723f90cbca4bb52f2011fecde3a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content. The primary external URI, 'https://trafffe.ru/123?utm_term=scholastic+success+with+5th+grade+workbook+pdf', suggests a lure related to educational materials. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://trafffe.ru/123?utm_term=scholastic+success+with+5th+grade+workbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470967/normal_5fb2cb620bf06.pdfIn PDF document text
    • https://noruvejepemapab.weebly.com/uploads/1/3/4/7/134702548/75d24aa7.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/e1b9c7337a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5fada21f66200.pdfIn PDF document text
    • https://guvegolisa.weebly.com/uploads/1/3/4/8/134861939/dimadewogimenefaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5f8f03602bf8a.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/sevewadavasud-lenelafe-positoboz-vetuzeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_5fa373f6be09f.pdfIn PDF document text
    • https://tonurokekar.weebly.com/uploads/1/3/4/4/134456200/8260478.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/489360bd-c52e-4dc9-8e37-1c67500695c6/refanegubugenofi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0dff3570fb44d1ca9592/1606290945929/rvca_free_stickers_request.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc07dde27a199023ab34438/t/5fc0e4b6bc819f1cf4f8b73e/1606476983055/acs_organic_chemistry_study_guide_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136a8681-1326-419a-954e-ce40ba0646c3/la_isla_de_los_hombres_solos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00e18872-d045-4730-9f79-68825bed9a29/famous_people_from_north_carolina.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF13 3612 bytes
SHA-256: ff2cb82da76e574df83c300873289acbe2a3a92d6b46b50ab8fb12e20898ae06
font_01_sfnt_off0000cbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE1 5940 bytes
SHA-256: ac23f9c8469bcbc21af99adb66cca44b5c63d0429073edb3a88a2520f7f62202
font_02_sfnt_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 10600 bytes
SHA-256: e9cd9ab85d0f671aaf84b61456c5d90574398eaa65cd96efc1b6729dde9ef426

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