Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a735c48886cbebe…

MALICIOUS

PDF

78.0 KB Created: 2021-03-20 04:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 31cc687fe7aebc6d5a23beb073bc855f SHA-1: 1fc9da84e5cca3bae287ffea7dc508c0966b60c8 SHA-256: 6a735c48886cbebe6838899a943ca30b2083a8acda38f04ff7fe2ebc76bcb273
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9998

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=cute+friendship+chain+messages PDF link annotation
    • https://cdn.sqhk.co/lilapanorup/yxQVgic/27313117637.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/agiieii/subaru_wrx_youtube_ken_block.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385216/normal_5fd06ef354b14.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/juzixoxavoxumozejuga.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/dafoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5fcb1d9e3f2f2.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/67308856293.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/learn_hindi_in_30_days_through_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/voxekum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a52155-6901-4186-8884-fcdb1559b5fe/84166552624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134def40-f812-4a69-a9a8-b48172a46843/85978580329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef543b8f-db34-4593-820d-2549815fcaa3/no_te_metas_conmigo_traducir_al_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba96b6e3-a017-41c5-b2f3-7216d64b1adc/63558045499.pdfIn PDF document text
    • http://peledopa.myartsonline.com/how_to_make_a_paper_origami_ninja_star_step_by_step.pdfIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_d7f97d003e424878970f42c715fdbf7f.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_269a2d5ae934407a91d147178bb370ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/6338491123.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_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 5440 bytes
SHA-256: 2042ec7502973c1155d8dd7ab8b534a4aa8ade4b0832eae1c4b3c67e06fac2f5
font_01_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 10724 bytes
SHA-256: 3d61212ca57da90fe5e5b49df7a26c45dcd0d09625e189dee097cae61811c3b2

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