Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e749ad1e0573e1…

MALICIOUS

PDF

77.3 KB Created: 2021-05-09 06:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f141d4fad5ef1d1f56b4c846ed50f619 SHA-1: 1ee70fb3da91ec7d9776c2ea400bd56a2f9e1906 SHA-256: c3e749ad1e0573e142147fbffd710d4e82ddfa8624051e3f9c486e019c62262a
206 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a malicious document, including malformed streams and a high ML classifier score, consistent with malware. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The embedded URL 'https://jacksth.ru/strik?utm_term=chemist+salary+in+germany' is particularly suspicious, indicating a potential lure for users interested in job-related information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jacksth.ru/strik?utm_term=chemist+salary+in+germany PDF link annotation
    • http://smm-target.ru/html_anchorzpweb.pdfIn PDF document text
    • http://nopufejumimub.22web.org/bleeding_steel_full_movie_filmyzilla.pdfIn PDF document text
    • http://hydrofthol.space/zadumotonebuxivipdrggl.pdfIn PDF document text
    • http://s7hmus.org/abecedario_para_nios_de_preescolartuw5w.pdfIn PDF document text
    • http://freefire-gifts.com/6426072021yrh8t.pdfIn PDF document text
    • http://photoforce.ru/lombardini_ldw_2204_m_manualmfexi.pdfIn PDF document text
    • http://latujor.22web.org/62609951910.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_f62c2737e13a4a15bd9557ffaf191933.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_d56f354d3f974276841dda6c2372d792.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xajowu/monthly_business_expense_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/71600453070.pdfIn PDF document text
    • http://maxisoluxutur.epizy.com/ketogenic_food_plan.pdfIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_287f3b7120834264929e65e6a50068b4.pdf?index=trueIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_3603079a21384f94ba7ccfc230d3329e.pdf?index=trueIn PDF document text
    • http://zukixewagiv.epizy.com/kalelulejuwanoposiwujuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bb49e0-2bf6-4a1f-90af-b54938b6d947/flotec_pump_pressure_switch.pdfIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_961093c67e114fd1ba45528744dcec63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fbbbd46-0d7f-4b6e-965d-2bbcc099d8c3/what_does_a_dimension_in_brackets_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/dusk_game_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd72363d-6176-40a3-938e-10fba4376e2b/hp_p3015dn_maintenance_kit.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_9bda7aae3395434dba9342ea36dd4687.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_4670a23bec104b608f29f83f1fec0783.pdf?index=trueIn 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_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 5104 bytes
SHA-256: d2979fa0c0e9ee59ae52c6989ac4ed83d130c976b114a68a1f2980c5890b974c
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 10884 bytes
SHA-256: ddcc6798176ffd3b5fa5b0d85d3e1b2aaac83609129c33bc5d7d7aea23e47cd7

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