Malicious PDF — malware analysis report

Static analysis result for SHA-256 79290f4f70b337cc…

MALICIOUS

PDF

116.7 KB Created: 2021-04-25 22:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 06888fad9e853be4635d5bbc73ee7d6b SHA-1: deb762c5401fe52d2d51e9e18008095841e2e348 SHA-256: 79290f4f70b337cc7264fe3592a792f381438904f49b464a4ffb3b1d6b99fc9b
226 Risk Score

Malware Insights

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

This PDF file contains numerous invisible links that redirect to external websites, many of which are part of a link farm. The primary lure appears to be a CAPTCHA-themed page, suggesting a phishing or scam attempt. The presence of multiple external links and the ML classifier's high confidence score indicate malicious intent, likely to direct users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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://gimoguvi.ru/strik?utm_term=burger+king.co.uk-menu+and+prices PDF link annotation
    • https://cdn.sqhk.co/xokipuxat/gfciinm/home_assistant_alexa_media_player_captcha.pdfIn PDF document text
    • https://lisewaduw.weebly.com/uploads/1/3/4/3/134358893/83e0e5ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_600cebe344361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_6063e3bc2f50a.pdfIn PDF document text
    • http://trenolgia.buzz/kedukupirc7.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/oggihhi/pocket_door_installation_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/RM7b7DV/difference_between_barbershop_and_hair_salon.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/4acc29cc5e55.pdfIn PDF document text
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/liturok.pdfIn PDF document text
    • https://cdn.sqhk.co/bomaguvodar/gfidpib/53653679766.pdfIn PDF document text
    • http://fruitnaturs.space/meso_maya_menu_addison4km4a.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://uploads.strikinglycdn.com/files/ba2b5c0e-da5f-4a57-a3ad-2f33d0b1db34/vipoxasibipodurakaful.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/6240089201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b7c544-60ab-4405-a6af-38fd7f57f8ed/fegifariperomaxidonuzuv.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/8952522211.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/how_often_to_change_transmission_fluid_mercedes_benz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61503593-90af-46aa-ae42-acd2f9efd95a/what_is_the_easiest_metallica_song_to_play_on_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ff0465-c884-442b-b9d8-261420359511/zokitiwofesiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afecc58-3513-4964-ae4a-49a3b61b7f92/sex_offender_registry_va_search.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_off000179eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179EB 5340 bytes
SHA-256: b81b1f605f077435220fa6207263e764c8cfde87afbb27b41b8118dc91c3de9a
font_01_sfnt_off00018bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BFC 12540 bytes
SHA-256: 711bcfcc2c1d8780052500312a14f9c27e324501e7c30b58d3f13146a043c179
font_02_sfnt_off0001b61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B61A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2