Malicious PDF — malware analysis report

Static analysis result for SHA-256 f023e55242c9614c…

MALICIOUS

PDF

67.5 KB Created: 2021-04-03 18:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fc1b64d1093e54d12d6cac6e68801ff1 SHA-1: b0328ce9a6358c97459276b85571dffcccd659bb SHA-256: f023e55242c9614c44700299ddf81f374845a88b2dd4ad07dbd5a70ef032784b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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.
  • 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://lozipotod.ru/wix?keyword=english+transcription+practice+worksheet PDF link annotation
    • https://cdn.sqhk.co/mewobonovagi/jfgcZsd/write_short_notes_on_computer_memory.pdfIn PDF document text
    • https://cdn.sqhk.co/lojenozasila/2gfxxsE/12271993497.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/3XidUUX/ms_powerpoint_themes_free_2016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460975/normal_6010020ab15e1.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/UiejaHX/59318602217.pdfIn PDF document text
    • https://cdn.sqhk.co/fugutexifi/cjcOLgc/55699620586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_605c97dc1b343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450046/normal_601283f492c62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_605af736e349b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_6024869293b41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d62ccc8-e4aa-4d7e-89cf-ad734120e85e/2003_mitsubishi_eclipse_transmission_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1628f151-a07b-43f3-aa7b-71f79787eee8/what_is_fire_in_beer_pong.pdfIn PDF document text
    • http://varupasasadutab.rf.gd/5912234899.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_894cf63d87474e53a1cc1d5ff002af3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98f8d7b-4041-455d-a8f8-9746f68f711c/33430788085.pdfIn PDF document text
    • http://dipuvomefig.epizy.com/evil_rick_and_morty_piano_sheet_music.pdfIn PDF document text
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_f1a49bf7a52b4b3e94e64506e86d51e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e63cbf5-cce9-40b4-8dc6-c2d9a31c91a9/integrated_chinese_character_workbook.pdfIn PDF document text
    • http://davosazofopamis.rf.gd/logic_gate_circuit_diagram.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_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 5308 bytes
SHA-256: dd8cf9c66b5937b197ac1f5559b6489b719f75de2f3cad65b09f47da2739175e
font_01_sfnt_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 11444 bytes
SHA-256: 3eb419cf350631c5edc39628ee12b3901d5b3df9d9f8c64d7dd353bacab4a313

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