Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe25bd5f96c5daac…

MALICIOUS

PDF

90.8 KB Created: 2021-03-13 15:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 35a9120b4a8684f866a87061501e3e50 SHA-1: 902ff46a9dc1a97cd2bd034385775a54f9b13686 SHA-256: fe25bd5f96c5daac8e48d25bf641737f878b4e5e28ca9e80eefc36fabfe7df65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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=update+android+10+huawei+p30 PDF link annotation
    • https://cdn.sqhk.co/jijasitov/fji4Wk8/new_york_city_fc_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/yhaijzU/miranapigajujanuzig.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/algebraic_equations_grade_8.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/igwbjht/85442851010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498883/normal_602c74a3e78c1.pdfIn PDF document text
    • http://parkingtest.xyz/maplestory_bowman_hunter_skill_guidef1iwk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_604314cf6ee06.pdfIn PDF document text
    • https://cdn.sqhk.co/pobusafi/iihcjeW/5381587652.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/pdf_books_online_reddit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_6029628c9357b.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/rilumaraxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_603c7127cf409.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/47023028970wfvkd.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/2d39b4a3-40ab-470d-bc16-ee6c40b2c8c2/ruzavukal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be6f84c-2f54-418d-a476-d65380b2d730/21048212814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00a78b6-aff8-4cb3-877f-6fa068e13437/9322335353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839a3ae2-9271-4329-89bc-570101aa2e6c/8996762471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df315974-a401-443c-b7d4-41bfab6ccccd/what_is_computer_ict.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f236eb-5136-4658-816f-92ac409a4948/como_convertir_cm_a_pulgadas_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c30424-de20-4463-b5d5-e2c6bd221748/radiwow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e1cd1a-8532-4da0-ae33-e3c4840460c5/pomizuvorivifudakol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74ccfce-6cf4-4b3b-9f8c-4fa20518dca9/90122451704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c324767-c6e9-4098-9e4c-a0ecd4ccedd4/27631625263.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_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 5276 bytes
SHA-256: 28e587fc46e7ef963f69443269216431015487364a767acfdad87f4845de7ba8
font_01_sfnt_off00012cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD4 20408 bytes
SHA-256: 088cf4f16578b877bb761b324467e0b0186a16971abc38f38eaf04d9f54ea08b