Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e425642669e0218…

MALICIOUS

PDF

77.8 KB Created: 2021-06-10 12:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 47b0eb5af57afc58acc55b10f889c686 SHA-1: 0b9bea982fae05640bb489a75ab2aade4474003e SHA-256: 1e425642669e0218da36217942b1940ff678b56293ca04998d3e558a55499617
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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://mezovuduw.ru/123?utm_term=writing+sensory+details+worksheet PDF link annotation
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/tosefumaki_beporur_purusup_palomu.pdfIn PDF document text
    • https://kinimozudex.weebly.com/uploads/1/3/4/4/134498073/werapefoluvef.pdfIn PDF document text
    • https://xavelimati.weebly.com/uploads/1/3/5/2/135298033/popedafonosim.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/riwejitul.pdfIn PDF document text
    • https://xadebunurag.weebly.com/uploads/1/3/1/4/131454816/a8436e4356a2071.pdfIn PDF document text
    • https://dedejabo.weebly.com/uploads/1/3/4/8/134875177/jodovelomoza_sukeriwisak_tubimutakakarex.pdfIn PDF document text
    • https://teviwodujote.weebly.com/uploads/1/3/1/4/131453741/xepidojoxuwu.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/moxunaliragab.pdfIn PDF document text
    • https://lafotavesa.weebly.com/uploads/1/3/4/6/134633764/lolulek-tekeguk-zinetuzekijoge-kininezodepugo.pdfIn PDF document text
    • https://panujiwawavila.weebly.com/uploads/1/3/4/4/134457592/mofov-bimokesegutafa-wokoluzupuf.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/2e735d4c-5771-40d4-8ccd-b70b2a991b45/zuxetekogisako.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/w/file/fetch/144513264/nightwatch_a_practical_guide_to_viewing_the_universe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0e05b2-586c-4520-91d4-35411895afa5/41408783328.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144423462/buvirixu.pdfIn PDF document text
    • http://pagorevet.pbworks.com/f/tedibojunazatuje.pdfIn PDF document text
    • http://nukuxim.pbworks.com/f/how_to_change_background_on_zoom_without_green_screen.pdfIn PDF document text
    • http://zazipav.pbworks.com/f/vice_city_game_download_free_pc.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/f/how_to_connect_sylvania_bluetooth_speaker_to_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d023b9ae-c89d-4ca8-87b5-35f50d4a19e4/8225808527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0945fca-15be-42eb-9a7f-83897e12b879/concept_combination_table_definition.pdfIn PDF document text
    • http://lipadune.pbworks.com/w/file/fetch/144414207/rofosibakiwejojidopuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fcf6809-c7bf-446d-b7f1-1b3731d3fef3/dodafovopa.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_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 5360 bytes
SHA-256: 15a20daab3ab8c814853835b5041c8bcfa5055ced1d3ae85be16274d33effa50
font_01_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 10196 bytes
SHA-256: a51f7a4ac010651b90a5fa68891749b2650440424fb9fe0eb7d525ad4b5b5040