Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5694b21f2d2222a…

MALICIOUS

PDF

100.3 KB Created: 2021-02-16 08:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 781a8048dbfcffb547d2d895563eac4c SHA-1: 36b9924d12f764ea7968443ca73fe3523824b99d SHA-256: c5694b21f2d2222ac34d04dfbc83572adf67d83be2ab603099b4421f57878b1d
252 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=janome+sewing+machine+manual+3125 In PDF document text
    • https://cdn.sqhk.co/tosobulig/jhgeriY/miwedituvekobafis.pdfIn PDF document text
    • https://sezowizubuv.weebly.com/uploads/1/3/0/8/130874308/tofimigokujove.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/6810044.pdfIn PDF document text
    • https://zopojezumaze.weebly.com/uploads/1/3/1/6/131637354/gilega.pdfIn PDF document text
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/xudevaki.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/8414360.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/85i5ith/2020_election_ballot_florida_explained.pdfIn PDF document text
    • https://kinumefiboposif.weebly.com/uploads/1/3/4/8/134865532/2310c01cd0e318.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/1815306.pdfIn PDF document text
    • http://interstart.online/movimiento_circular_uniformemente_acelerado_ejercicios_resueltosaclj5.pdfIn PDF document text
    • https://nixetamusizag.weebly.com/uploads/1/3/0/7/130740210/xororuxem.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/djiFvii/lemon_cake_recipe_with_sour_cream.pdfIn PDF document text
    • https://cdn.sqhk.co/nilimijano/oiiieMY/all_planets_in_the_solar_system_revolve_around.pdfIn PDF document text
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/nivukitaninive.pdfIn PDF document text
    • http://instapriz.site/pejiziwabogefukawilabu2279w.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
    • http://wurasegato.rf.gd/avery_5160_template_staples.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/diagnostico_de_enfermagem_nanda_anemia_falciforme.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/suwevokevepesasobe.pdfIn PDF document text
    • http://wexiwifobezaxi.epizy.com/fundamentals_of_corporate_finance_questions_and_answers.pdfIn PDF document text
    • http://wegewid.epizy.com/havana_backing_track.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/metro_ui_bootstrap_template_free.pdfIn PDF document text
    • http://dujenovonufu.epizy.com/31692301166.pdfIn PDF document text
    • http://bevevekafoli.epizy.com/75099273876.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/andhra_university_b._ed_syllabus.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 25636 bytes
SHA-256: 74e537e21b5a8edd659b2a55eb8a0b8f53c7968ed84b1e6e087e920ce78020a0
font_01_sfnt_off00013d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D02 5472 bytes
SHA-256: 339aed618cedc6abc0b1aec6c971d5d624a979b30cb8fa8c75598e9b69015219
font_02_sfnt_off00014f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F85 11324 bytes
SHA-256: 90ee2c939d39960918ae8e21140de323f63977d30107188870528d6e652bf3d3
font_03_sfnt_off000174bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174BF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378