Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7ae7dcd6260202…

MALICIOUS

PDF

94.2 KB Created: 2021-05-20 13:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6db1d4bb1957af21a924374c54a1568d SHA-1: 9cf543d6ef7f8dbdee5cfb30bedefb1f11e59618 SHA-256: fb7ae7dcd6260202935a3c8703631bb8666de1f70160d1dcae8f80035dd54e9f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as legitimate content. The primary URL, 'https://kuzutuzo.ru/strik?utm_term=broiler+breeder+production+lesson+pdf', suggests a lure related to broiler breeder production. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate a malicious intent, likely for phishing or distributing further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=broiler+breeder+production+lesson+pdf PDF link annotation
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/tezefafodijuran-dojirigikamiwej-kesurabotiwiz-tagukisap.pdfIn PDF document text
    • https://kovajokuluvemu.weebly.com/uploads/1/3/5/3/135335912/xiwuzizinodugexol.pdfIn PDF document text
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/75cd7903700fe98.pdfIn PDF document text
    • https://bebefezagogu.weebly.com/uploads/1/3/4/3/134372182/kukizituximojisemit.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/6e89bb770d1245.pdfIn PDF document text
    • https://mizojomi.weebly.com/uploads/1/3/0/9/130969452/buwazudazew-wikobakepit.pdfIn PDF document text
    • https://rapexinet.weebly.com/uploads/1/3/4/3/134328854/7628551.pdfIn PDF document text
    • https://pizupunaj.weebly.com/uploads/1/3/1/4/131406403/99043.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tuzakifezara/11868136030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2806b8e-adec-4c89-abc5-f6c740665628/blender_2.8_tutorial_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c8e692-8b2d-461a-bbb0-be533c21de5b/77262025782.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/kuwixejab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81acfd02-e116-42c3-8172-58504ffde0b6/polygroup_summer_waves_pool_pump_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ca863e-d9c1-4a05-8fed-ac0a30b230ef/wakofado.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/7832460699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501bbed1-8464-4988-a388-d1e251d0abfb/lodemugiziv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7486eda-5942-4c54-8210-3a8bf5d68814/51896862814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ca395f-0e7e-4a53-9969-026f9d94a842/how_to_write_a_script_for_a_powerpoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c006a7a-7a49-43b6-a56d-64631f0f3e5a/sig_p238_vs_p938_comparison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56e8bda-668f-49ac-8c9c-961067139cc9/how_do_i_enable_the_command_key_on_a_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/530e4774-6260-4df1-ab5d-21dccc22e906/68480421082.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/wijedikofemas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728adb97-72a4-4ac4-94ba-7634fce2e783/61726234235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c182d1bc-b0f0-42eb-99b5-a6db84e7da9e/how_many_drops_of_lavender_in_diffuser_for_sleep.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/where_to_put_vicks_vapopads_in_cool_mist_humidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a127182-6627-4354-8032-b65cbaf9ca64/xiwafe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 5008 bytes
SHA-256: 04bb3173fccf1a36b8f7d695f07fa0b0f53f119bcbdde17e8cc503472f3f51c9
font_01_sfnt_off000137f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F4 10808 bytes
SHA-256: 5fe0576664b4b14944c6625914188edf0f5ed2652496b8578d3c8632fef39960
font_02_sfnt_off00015cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.