Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a803b8cc0fffe2…

MALICIOUS

PDF

86.5 KB Created: 2021-04-09 10:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ee58ee7c9cde8796b896630ebd4c632b SHA-1: 7a2eb2493225e62f2bca3788f908c2ffa8d03615 SHA-256: 44a803b8cc0fffe2f027008f074c50d60df41b1bce492ff29764338527581932
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into clicking through to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=2000+ford+ranger+center+cap PDF link annotation
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/933e4a.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/6950105.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/bgdhcnt/arknights_recruitment_tag_top_operator.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzemesafe/jjjhacj/53843747860.pdfIn PDF document text
    • https://lajexupizad.weebly.com/uploads/1/3/0/7/130775806/sugisuxajewitikumeve.pdfIn PDF document text
    • https://wigabededonekan.weebly.com/uploads/1/3/0/7/130740374/22db34588577c.pdfIn PDF document text
    • https://lixijuzi.weebly.com/uploads/1/3/4/6/134626773/a03d1b4b6c0376.pdfIn PDF document text
    • https://cdn.sqhk.co/zanaforare/ZhcDEFR/kadafarufevexepufurataj.pdfIn PDF document text
    • https://ramoxibe.weebly.com/uploads/1/3/1/6/131636726/supigu-judajozume-sibifizo-rimobu.pdfIn PDF document text
    • https://wapaberupuz.weebly.com/uploads/1/3/5/3/135397773/8880a.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/iiehiLT/sad_quote_broken_heart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beperedusewigu.epizy.com/leyes_laborales_de_puerto_rico_enfermedad.pdfIn PDF document text
    • http://kunibenurupamiv.rf.gd/87685248030.pdfIn PDF document text
    • http://bedopevidorofi.myartsonline.com/wastewater_engineering_treatment_and_reuse_free_download.pdfIn PDF document text
    • http://fabonejane.onlinewebshop.net/pemador.pdfIn PDF document text
    • http://novoniranalisa.epizy.com/nagugubas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a614c0ea-0faa-43c4-a8bc-b3baafc95df9/why_did_god_remove_the_tree_of_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72aac877-b617-4c75-a9e5-1abff1f26ffc/river_flows_in_you_violin_sheet_music_lindsey_stirling.pdfIn PDF document text
    • http://mewilibuze.epizy.com/ringtones_naa_songs.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/budesonide_nebulizer_davis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/172c9e94-281a-4cd8-a0f6-bde9528bd380/how_to_notify_post_office_of_name_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40121726-0d9e-4386-b3df-a38a3b501a17/stevens_320_12_gauge_field_grade_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5177fde9-00ea-4593-bdc5-a5d22f06e06f/sukovasaze.pdfIn PDF document text
    • http://kevikawimal.epizy.com/speaking_worksheets_for_kindergarten.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_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 5292 bytes
SHA-256: 3b0fe3ac351226b49ed1783a64d671061bf16ddb1b6cab56180fbb0768ccf676
font_01_sfnt_off000126ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 11012 bytes
SHA-256: f8e72d7f19837e248f990529937ff4e21eaa74023d20c6a49f52efb34996c6bc