Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f0853cca2c495b…

MALICIOUS

PDF

80.0 KB Created: 2021-03-15 06:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4928e553d7c49ba17342ffd46da2fb2c SHA-1: 64dab14e248dde814a09d1cee726e6b15a269192 SHA-256: 56f0853cca2c495be01a3ab626bdad9eed9c8ab57ba72157f2442ef3ff4fdff4
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure strongly suggest this document is part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://druttle.ru/wix?keyword=viking+facebook+tool+2020 PDF link annotation
    • https://cdn.sqhk.co/jokalirubore/hbwjaH8/hachi_express_japanese_grill_seneca_sc.pdfIn PDF document text
    • http://immorta-cross1.club/purple_weed_strains_sativaulb2p.pdfIn PDF document text
    • https://cdn.sqhk.co/dodagirojep/ghuGhgd/hd-_dta100u_digital_terminal_adapter.pdfIn PDF document text
    • https://cdn.sqhk.co/texaxonaguzo/hiiaidx/competition_music_mp4.pdfIn PDF document text
    • http://websporizle3.com/87032670418cmxmr.pdfIn PDF document text
    • https://cdn.sqhk.co/wifurovud/4ic58Gi/69525964191.pdfIn PDF document text
    • http://raifaisentgo.online/hybrid_and_alternative_fuel_vehicles_haldermannkq2i.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/jKfuvtY/44900152935.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/jijgf6n/revuzojamanupatovumu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_2acafa0481634a2fa2bbb2fcb6e46797.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5031b9-a9c7-4b1d-a2d3-d32ef450c14e/sobuwajofukepegese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36d6d34-5ce8-45e0-bbf0-e5349d6c4203/5797007097.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_f5d1f7d05f1a411f94b23b8d9a5e105e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/734f42cc-6511-4159-aeac-040b04d46844/3965716887.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_993e7ee25fc24e60b91a2842967e4e4c.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_c4862fbe68cb411690822bf5640259cf.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_f18556a4cd4945559379cbd5545faf2f.pdf?index=trueIn PDF document text
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_6910aa6538044d81be687fee37ad8193.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b58de9d-e546-4ca8-9e77-8268e9db7bae/52404850253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b622539f-d126-47d7-9463-35ba6360c724/50013644997.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_b331572f920741c691506467ff068616.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_521b68dfb6df42778a2d35247f6ca965.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_4fdc44b9351e4779991fffd685224482.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_140b7ac5e60844c9879cc2bd1c3a359f.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_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 5216 bytes
SHA-256: a0e3ca4944a6c9fa2b0e879f5abc2213289949630add91fe85580cb39ca9ebaf
font_01_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 10436 bytes
SHA-256: d7cb404634202182b0412f30121ad9edb0407c341e64c6d6cb90253b78cf580a

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