Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb86fa0ca1ff8eb…

MALICIOUS

PDF

80.7 KB Created: 2021-03-18 13:24:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 118909c207822f5c5391c717a2839312 SHA-1: 19e060f07df72d66c1f8641a5eef4859353f7df2 SHA-256: 9fb86fa0ca1ff8ebeb1f46a018a9230d05316c072113a8be3c003496e83ecf3e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Habanera piano sheet pdf', directing users to potentially malicious external sites like 'baarspo.ru' and 'avit0.pro'. No scripts were extracted, but the PDF structure itself is used to host a link farm.

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/award?keyword=habanera+piano+sheet+pdf PDF link annotation
    • http://avit0.pro/assassins_creed_dual_action_hidden_blade_blueprintsbwkfo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_6027dfc5944c7.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/gcRgdkQ/clash_royale_sparky_deck_arena_12.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/qWFgh2f/arcgis_earth_system_requirements.pdfIn PDF document text
    • http://natbeach.space/xutalupulimim5kfpd.pdfIn PDF document text
    • http://ranking-se.com/conair_1875_hair_dryer_manuallpb9g.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/rL2gpid/secret_note_19_stardew_valley_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426974/normal_5fd0664ee48de.pdfIn PDF document text
    • http://easycreditscore.info/what_is_the_basic_definition_of_physicsxx0q6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_600ae81e1c9a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449392/normal_5fe6f96b7fad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_60421d49ab915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_2753a2446749416aae9cc9a2a49ecb18.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_447fb72d6b194312851047799b282029.pdf?index=trueIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_451599c7f90448ecbaa1b8f6e6be9238.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_3d7d8bbb0f6243278b0334170d529704.pdf?index=trueIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_83f01c569bd94d8289fbd1d64bc57f06.pdf?index=trueIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_d7013b12004d49508a02429bdba72395.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 5200 bytes
SHA-256: 467ae2500463d4df5ea3da2a160ed61ef9e3c63366a28f6882a12beeae8d5a50
font_01_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 3052 bytes
SHA-256: dc4e7ddf6cb0b874fd432f39be231da3a1ac61adfc8f4701c6456f17586a5101
font_02_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 12808 bytes
SHA-256: 258c8e2708a4b8c13e4ce5f98226dda79406f6fbd9df1f7701c7822c29fac112