Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9ad35c65b1a456…

MALICIOUS

PDF

82.3 KB Created: 2021-03-25 15:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f47ee626b37ca9d21aed352c5f62521 SHA-1: 97e7ae520d4f5036cf81571b3dfa32216201c75c SHA-256: fd9ad35c65b1a4560ea8cc4b42dca1dcfb2f4801787a78f077f7ed41a21dde6e
186 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. 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 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://baarspo.ru/strik?utm_term=what+are+some+false+gods+today PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413468/normal_601910bcb46f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391915/normal_5ffa4e6a54e4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_5fd0dfddc2c32.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/44798305614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9005981c-20a7-4b93-9dfe-a591c0bc6fcf.filesusr.com/ugd/afbba5_7769896276294ef5911be9764d3cfca1.pdf?index=trueIn PDF document text
    • https://722d0b64-886f-48d6-ad1d-3f240095bb95.filesusr.com/ugd/07f6b3_cf9b1e305ee246a0855dab4d1291ef92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d5f85f-d70a-4b93-b17b-5818c4f73577/68167009763.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/what_is_fish_in_hawaiian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2211195e-c1f3-4883-9038-fb79d08d3968/rt-ac86u_review_smallnetbuilder.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_ec0fe2ffba634d288cbfa523a4f4e2ef.pdf?index=trueIn PDF document text
    • http://lusajafimaneru.myartsonline.com/pamusubaxuvewudiruzipupam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3d358d-b132-4344-ad76-eca152ce0a0b/who_sings_im_dreaming_of_a_white_christmas_in_home_alone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd21adf4-5b64-41e0-83b8-6c1fce579f5e/sligh_grandfather_clock_chimes_wrong_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428072ee-4034-4e9f-9cb1-7442edcfe4a5/easy_piano_christmas_songs_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/pomifiradofajavuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/binomial_theorem_iit_jee_notes.pdfIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_41bb60a91d764c26960cb010fbe04603.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_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 5436 bytes
SHA-256: f3c8ffaee572224d322d5a24018f6a9454e37db4944635ef37eb403b1086c845
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 11280 bytes
SHA-256: 739cf5144ce8f28a8dbf2e98afacf03f167655bf18d77a834c77d53833d8c715

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