Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b5b496a43ada4b…

MALICIOUS

PDF

86.4 KB Created: 2021-03-25 04:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae499f0ab6d4c7a6c526f5a397bf1d39 SHA-1: 3d0c5bf13584914d348d2d65ab382f2477d026f3 SHA-256: a1b5b496a43ada4ba0464e1aff5bc7c59b0d551b10c781c96c92a8e6e6507f6c
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 0.9958

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://bologen.ru/strik?utm_term=titulos+de+credito+definicion+ley PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455194/normal_5ffe86a9b5b35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403952/normal_60298b334f92e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_5fce91dd8800e.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/waromeroteza.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/joint_fleet_maintenance_manual_volume_6.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/assert_50_mg_bula.pdfIn PDF document text
    • http://lidobexi.22web.org/55057402597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_6046491423559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453102/normal_5fc60334b254c.pdfIn PDF document text
    • http://fogexiduk.22web.org/77375340896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://telenusu.epizy.com/5467220057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b46ef6-6885-4e14-a201-dac3872153e1/the_warrior_diet_reviews.pdfIn PDF document text
    • http://bibezakomi.myartsonline.com/bearing_number_calculation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76fd322b-b85f-4cfd-82bf-0880c97aa0d7/37813708657.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/pipeviguviwakokizi.pdfIn PDF document text
    • http://fidolujure.rf.gd/inicio_ao_escolar_2019_20_republica_dominicana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfc4d24-5d5c-4513-9ee5-ebb4b7f8ac63/navy_officer_fitrep_closing_bullets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f4815f-c591-4271-9a1f-b67352f6c82d/mizuridigonelojasakugewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79db13b-55cd-4fa7-ae15-da218858051b/18335504367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599cc66b-3af0-4f28-9333-c55097194420/56900734704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/989783bc-8884-43ac-b906-30c9a19f082c/xozijejezufigawugez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d58420-1eb8-4782-84ed-be71c56f5e5e/53617652337.pdfIn PDF document text
    • http://bejopobu.epizy.com/jurnal_afasia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7850cd-c1d9-4dd8-91c8-10cfd4a6f24d/nuzajatowoxujaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd0fc5b8-c11b-4b8a-92c3-18e5ddd3c347/zuxakepetemibavufixoguk.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/10429873497.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/lafayette_parish_louisiana_arrest_reports.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_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 4856 bytes
SHA-256: 558d211052930cda0febdd68a328cdee3308bd9998a05a7bbd8f38d1958e0382
font_01_sfnt_off000123f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F3 11636 bytes
SHA-256: a93f5d8d31e1a8ad2745585bb1ca171e16f0a76ca290ab350e4690ac970426a7