Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abf18fc1a2ad7b5…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 21:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0138bdc58214270e8b10c1fc0a88df98 SHA-1: eeb1881eecc496190bf8d4f6d4cd5bc97d521cf7 SHA-256: 3abf18fc1a2ad7b54bffd41595164ac7f45d7856352cbf7a54d066fe339e1a99
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=a+level+biology+questions+by+topic+edexcel PDF link annotation
    • https://vevavosabiwebe.weebly.com/uploads/1/3/4/3/134349804/6112622.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/5848835.pdfIn PDF document text
    • http://thefortykuti.com/basic_french_greetings_with_english_translationf0rri.pdfIn PDF document text
    • http://raisinshq.pro/dupegojazulipumamee1rh8.pdfIn PDF document text
    • http://douchehq.xyz/is_developmental_disability_a_mental_disorderdaw9e.pdfIn PDF document text
    • https://xagewomovow.weebly.com/uploads/1/3/4/0/134040632/gupatadowo-zemowiluzus.pdfIn PDF document text
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/wonuresuzomev.pdfIn PDF document text
    • https://vimosetadasosus.weebly.com/uploads/1/3/2/7/132740377/xarikuvavanaw.pdfIn PDF document text
    • http://kurs1.xyz/acura_mdx_maintenance_code_b139bhzl.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/lusato-lamive.pdfIn PDF document text
    • https://wemupubipu.weebly.com/uploads/1/3/5/3/135331653/senewapagiwiw.pdfIn PDF document text
    • http://podarokinsta.site/peaky_blinders_season_1_kickasspwa9h.pdfIn PDF document text
    • http://pumba-timon.space/6082307420394w9p.pdfIn PDF document text
    • http://community-day.ru/zadutovikoxesatisorldr18.pdfIn PDF document text
    • http://duplicwcnj.space/tokyo_ghoul_character_10x1jvp.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/teledyne_laars_boiler_manualx12j8.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/bachna_ae_haseeno_movie_hd_1080pfd8ip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/a._v._a_fps.pdfIn PDF document text
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_c5c11d724dc04e60910adfd2bc318898.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_16d360ce04f64c069a6ed73a57c5ee83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/norwegian_english_dictionary_download_for_pc_offline.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_e6d7e7fe1a3f44558257b9e342eca0b4.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_a44c1702a4d446e2b854a286d41e508a.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_0ecebd55ce08402e91b232152ae647a2.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_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 5420 bytes
SHA-256: 4a64955449218639714dfd8a1eeb41029697d3c30a704825642033f32dbac805
font_01_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 10724 bytes
SHA-256: 6a4104704deafa904301155f3275444acd56e630686b26d141578e5a70235496