Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d923c2cc0798a6d…

MALICIOUS

PDF

78.1 KB Created: 2021-03-15 05:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ffe2a7196a971a4c4ed879bc2ca42390 SHA-1: ea876106201d5146db0cd27687ecfaf7329125f1 SHA-256: 5d923c2cc0798a6d6a653ecb516d41ab096a376a9766af282355b3d72f493254
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 campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xezojetit.ru/strik?utm_term=what+skills+and+competencies+do+hr+managers+need PDF link annotation
    • https://figusemaf.weebly.com/uploads/1/3/2/6/132682639/3351f699.pdfIn PDF document text
    • https://vumufivazoxowe.weebly.com/uploads/1/3/4/4/134467728/6464970.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/eCEpYMG/mateziwelefilune.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371025/normal_6005dd6a68846.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/hfihijf/kimoni.pdfIn PDF document text
    • https://xipasole.weebly.com/uploads/1/3/4/8/134853136/5d2696a72c9f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418401/normal_5fecbcc85332e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_602cfd470b937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_6039a4f073d39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_60484f5284474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390069/normal_5fccc67774b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_5fe8225b9836c.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/hgMibjd/checklist_app_android_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_603338e718107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_6014dc359db52.pdfIn PDF document text
    • https://kazenoti.weebly.com/uploads/1/3/2/7/132740362/setidumepir.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/fjdmVgj/juwekeno.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/2077919.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_a196ef9a080d49de938fa00a2cc5decb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisagoz/5_elements_of_misrepresentation.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_ad77a8b1f9364c09905ac3c1a034bb9f.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_c68e92fd885e40e7a7068d59cfce67c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/sag_aftra_health_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/biriyani_movie_hd_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/zexojafalutenukop.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_2d8ce2f888454e85a5c009792c097b8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/cholo_paltai_full_movie_free.pdfIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_a1778d9d618749d899cb81252620aa3e.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_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 5564 bytes
SHA-256: 6045849d9f48eef69812ab347450dc8fb636c28ac6b12e2a6dbeeceac6d03d70
font_01_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 10348 bytes
SHA-256: 476da56fd6be06de4db743580a291da241bc2f0b1f4f6bb0fddf2fbae4d8bafd