Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8028218788df698…

MALICIOUS

PDF

79.0 KB Created: 2021-04-07 14:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 34991fcb2120089e0239d62028db4d81 SHA-1: 47c9bcd4dfcf2646f78e99fab8bcf967c70a4c35 SHA-256: c8028218788df69897f1fc120bf0ef39e926fe384d6577442ee34675501d447a
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. ClamAV detection as Pdf.Phishing.Trojan strongly suggests malicious intent. The ML classifier also flagged the PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=2+positive+effects+of+volcanoes PDF link annotation
    • http://penageli.getenjoyment.net/agile_methodology.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/21847215242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5ff425e0578fa.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/bldc_motor_characteristics.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/sexual_and_asexual_reproduction_test.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/95046270987.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/99347684675.pdfIn PDF document text
    • http://mesikigodijope.mypressonline.com/acta_de_constitucin_del_proyecto_ejemplo.pdfIn PDF document text
    • http://wotegop.22web.org/how_to_stop_bosch_washing_machine_mid_cycle.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/12164451442.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/vetexi.pdfIn PDF document text
    • http://towexiwi.sportsontheweb.net/nowurusaporoxezitovoruja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_605fa7344c126.pdfIn PDF document text
    • http://xazowagef.mypressonline.com/cultural_awareness_definition.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/sownictwo_medyczne_angielski.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/335fb067-a582-48fc-ac8c-ed07907c2f7f/how_can_you_tell_if_an_acid_is_strong_or_weak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0967d08-1118-40b8-bd05-de4449117684/deschooling_society_illich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6510f17-795c-4609-9ebb-dc89888ba02f/26157045888.pdfIn PDF document text
    • http://lajefuvubesij.epizy.com/23771495951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3646c36-3dc4-4a9b-8ee4-a5c43899cc48/how_to_improve_strategic_human_resource_management.pdfIn PDF document text
    • http://mudikavorutemu.epizy.com/chief_accountant_cv.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/60898461777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f499bb63-087b-4262-ae72-f86c54fdc496/how_long_do_you_have_to_workout_to_see_results.pdfIn PDF document text
    • http://widaliwadon.epizy.com/66048170893.pdfIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/caste_certificate_form_rajasthan.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 5008 bytes
SHA-256: f94c9b8fa053d98e5647d474d5924204ecc76bb0d6c32d62b341c6d974f5ea60
font_01_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 11736 bytes
SHA-256: 4ca5a96c2d20d6149017ef2a90266ac95c85a8668962a8f1a0edfc8d81440f1b