Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f6c27cdaff1d96…

MALICIOUS

PDF

80.2 KB Created: 2021-04-09 05:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9f63c2c3f5eb4a4e9b52234a735083e1 SHA-1: 71ee3e30871181651b4572eab02b656b46016dc8 SHA-256: 01f6c27cdaff1d96d9210d1f140d16759041d2dd6c6f8c9505abef98aaa882d8
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as a phishing trojan. It functions as a link farm, presenting a lure related to a technical book to encourage users to click on numerous external links. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates that the document may also attempt to solicit sensitive information such as recovery phrases or private keys. No scripts were extracted, but the presence of external links suggests potential redirection to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://midufefew.ru/strik?utm_term=cryptography+and+network+security+seventh+edition+by+william+stallings+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427313/normal_606745aa4cd26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_6031abfa02e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4526930/normal_605f720f7564c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_605185dcd8b61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387430/normal_5fdca2d3bd07e.pdfIn PDF document text
    • http://pedufan.iblogger.org/xebalirek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_60171c54a76d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_6051a294b81ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481418/normal_6026dd40d689e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dekagozavamog.epizy.com/baixar_netflix_apk_para_pc.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_f9598ab5c37148278b7848ecb8dff2fc.pdf?index=trueIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_5595cd21370a4ba691d573f12b1e1e01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/how_to_install_google_play_on_amazon_fire_hd_10_7th_generation.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_0bc350ba07834660b1d8865a0a609ceb.pdf?index=trueIn PDF document text
    • http://jonokib.rf.gd/xuvon.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/difference_between_nvl_and_coalesce_in_db2.pdfIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_a6e7e79b1963475aa671b003ab261605.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/89874538788.pdfIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_9b54b6551d9a4b7f9acafeb3c15ab1e2.pdf?index=trueIn PDF document text
    • http://supitemev.rf.gd/adobe_camera_raw_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/pomutisesajebabugovovapir.pdfIn PDF document text
    • http://lawurukipajuxe.rf.gd/86198404255.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_a975d0d40987427987a76d448e0cfcb9.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_f6100f66d8404401aad81a4b5c52ccbc.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_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 5932 bytes
SHA-256: 07127934811177d4acd21b7ae633c77c09f88562b4534e6724fea2174f4947e3
font_01_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 10560 bytes
SHA-256: 31ec4e8f1ffa966c208c0d3abac37f005a1f05be3e3237fb5fd32fb3dcd5d117

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