Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c3528c575be1b5…

MALICIOUS

PDF

75.3 KB Created: 2021-03-17 01:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6849feb0484ff02f9023d26cfc3fa712 SHA-1: 2302e6a84625593e07ef998d4eb1b73aeaa3efd3 SHA-256: b0c3528c575be1b5cae60c724011d42b556fad6067588172edf753264487299a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URIs, with a primary URL pointing to 'https://jumiwimov.ru/strik'. The presence of a large number of external links suggests an attempt to manipulate search engine rankings or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=a+raisin+in+the+sun+act+3+scene+1+short+summary PDF link annotation
    • https://cdn.sqhk.co/zokoxirinuz/K5hiM7Q/soccer_star_2020_football_hero_apk.pdfIn PDF document text
    • https://dumisoxi.weebly.com/uploads/1/3/4/6/134625223/6492984.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/4267772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_603942d9acc67.pdfIn PDF document text
    • https://kukibutojiw.weebly.com/uploads/1/3/0/7/130775835/fumunakabejamal-moxudubulosob-kinosusigosego-razepenapefo.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/ijIKvqj/39223093281.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/iIjhZhc/nobby_beach_shark_attack.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/nje1igi/my_neighborhood_credit_union_arlington_tx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_60236d55ee161.pdfIn PDF document text
    • https://sipobazi.weebly.com/uploads/1/3/4/4/134494275/dogisikupolu.pdfIn PDF document text
    • https://cdn.sqhk.co/bozawenibiwa/lQhehdL/how_to_complete_infinity_loop_level_111.pdfIn PDF document text
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/nebeju-wodotit-gavuduvixuka.pdfIn PDF document text
    • https://vewuwoxefi.weebly.com/uploads/1/3/1/3/131379256/didopu.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/8LijO4N/teppanyaki_grill_laurel_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/ihJJjf4/starlight_cinema_city_anaheim_prices.pdfIn PDF document text
    • https://boxavukexuzar.weebly.com/uploads/1/3/0/7/130775797/savorudeda.pdfIn PDF document text
    • https://musegozaxugovu.weebly.com/uploads/1/3/0/8/130873783/bukagogu.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/3467793.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/domowezibabex.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/performance_appraisal_format_for_hr_executive.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/62068639633.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/a_dolls_house_act_3_setting.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_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 5312 bytes
SHA-256: ccf67144e23c0eab2a1f780c97bf2ec7a9b66b9388b81ab85984fcdd69c848cd
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 10880 bytes
SHA-256: 8bf0f9b06208e19ec1a391809c66e2b82224990dd6af61ff06275e68fad4084f