Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18df0ec66ce9122…

MALICIOUS

PDF

81.4 KB Created: 2021-04-07 11:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 32088053f2745cdc8016341a03403ea2 SHA-1: 047fdf668c58ead2f5543aaada5388f5cbd1fa6b SHA-256: f18df0ec66ce912269c0bfdf14df5682542f1dea4fc0f289e679db84c48a3750
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 hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://gimoguvi.ru/123?utm_term=guideline+cpr+aha PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426080/normal_5fd2cdd30dcd3.pdfIn PDF document text
    • http://espaceclient-cmb.com/73490011982sr3v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_6043877cec40d.pdfIn PDF document text
    • http://betapadu.22web.org/rejibagewedetobavop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_604d79ef6ee3e.pdfIn PDF document text
    • http://durikudu.iblogger.org/10863595363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414500/normal_60000501ba75b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_603e838f45b60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_604f16e8e6912.pdfIn PDF document text
    • http://fortuneo.biz/6795572724knoh1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_605c0896c494a.pdfIn PDF document text
    • http://sarhello.online/lonedukikorafigosbh4xx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478961/normal_5fd07fe743a1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekolutunumoze.rf.gd/projet_energie_renouvelable_afrique.pdfIn PDF document text
    • http://vunivaluxok.rf.gd/the_new_oxford_picture_dictionary_english_spanish_edition.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_16df0afbbf7341dc9b51b0f351d5c969.pdf?index=trueIn PDF document text
    • http://fajodedepadabu.rf.gd/zipitimapibasubewow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6540501b-7c1a-408f-911e-2bc02de885c0/dudiwajupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352a40ff-afc5-4e1d-9878-7c95fd688fa1/instructions_for_a_clear_blue_pregnancy_test.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_7512348243c74d6d86ef4f6529402b98.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_db895eecd0ab4a2ba0dd05b80b959141.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_e02c97b0966042f992b408012de29ede.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/850756e8-0a85-4dd2-9bc2-408918c2af75/how_much_do_mcdonalds_employees_get_paid_uk.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_ed2bcf3724604d13a00d656c79ea340c.pdf?index=trueIn 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_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 5012 bytes
SHA-256: d83bf0319ba4810b953a170db39dc21a7d29060bf465aeec7ba8ca1f1c0a7f5a
font_01_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 11220 bytes
SHA-256: 3646e314038d56156fd374f0f725cec1933293a60f75cd3edb7e355268eececc