Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c77075d37bb2f7…

MALICIOUS

PDF

73.7 KB Created: 2021-03-09 08:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c573165f58b181b958e9e77ef5c982a5 SHA-1: 9f1a0794dd227b3688d2cfdc5b81573723338852 SHA-256: a7c77075d37bb2f7b49f61298134846596b5a6b8cc36b34a0cccc65724c8557d
186 Risk Score

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 0.9995

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=ccrt+art+and+culture+book+pdf PDF link annotation
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/5264836.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/jisetetejemame.pdfIn PDF document text
    • https://bobiputab.weebly.com/uploads/1/3/2/8/132814039/zedopojupewuwog.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/zuvujezorisajuleru.pdfIn PDF document text
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/mesedirujis.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/43283615070.pdfIn PDF document text
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/3130577.pdfIn PDF document text
    • https://namawigedolo.weebly.com/uploads/1/3/4/4/134497053/lipopox.pdfIn PDF document text
    • http://zzzmmmmejjj.space/us_army_tank_gunnery_manual4093h.pdfIn PDF document text
    • https://wufodiwefoveve.weebly.com/uploads/1/3/4/8/134891768/zakutibo-nebikaxip-tebifurowi-muguvagavuzaxo.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/how_to_start_a_bakery_business_in_nigeria.pdfIn PDF document text
    • https://wifojulov.weebly.com/uploads/1/3/1/4/131438113/c1a82778eb.pdfIn PDF document text
    • https://nudesobaxoxis.weebly.com/uploads/1/3/4/6/134666739/sivesar.pdfIn PDF document text
    • https://namunoxup.weebly.com/uploads/1/3/5/3/135339392/8857890.pdfIn PDF document text
    • http://itwomen.space/vufegekusejozolayts43.pdfIn PDF document text
    • https://suzavopuwo.weebly.com/uploads/1/3/4/6/134686694/wabunifutepa.pdfIn PDF document text
    • http://dontbeshy.xyz/how_to_use_dual_power_pro_carpet_washerb30ec.pdfIn PDF document text
    • https://xavabakonoliwif.weebly.com/uploads/1/3/4/4/134477423/sonalajerepoz-bezuzolakofet-pitajog-warenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://4f0f5a39-0a2f-4cdf-b4e4-40a644fad8b9.filesusr.com/ugd/2024fe_d4d66fc175334fc9991a3663f988d46f.pdf?index=trueIn PDF document text
    • http://taguloxutenafol.myartsonline.com/livre_hammoudi_appareil_digestif.pdfIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_d4736598d1a54ed28b0738056b050671.pdf?index=trueIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_1144139d548b44fe95f436e57a7f64c4.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_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 5080 bytes
SHA-256: ec9d467143b0de71df824fd6dc47e86c867ab65bf240154f30040803d85027d9
font_01_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 10188 bytes
SHA-256: 3a0531bfd17b0994efd386478c44bac53041960bfdc4d8fa53bf284662199b94
font_02_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 2684 bytes
SHA-256: 37aeb85d01896bc783f600629dd55af906efd7a93388b2225c52c7c02a8b8bd7