Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96f5341e1bd7744…

MALICIOUS

PDF

79.2 KB Created: 2021-03-24 17:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 898ce083bb92670ede2c49d6d269d3b0 SHA-1: bab092684bcd3988c6b65dbe1297d4e25e1b60be SHA-256: a96f5341e1bd7744dba058cd927adbeab53587d4dcb83e82bc817db3375ae862
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting domains, suggesting an attempt to obscure the ultimate destination. The primary URL, 'https://resalured.ru/strik?utm_term=rimas+y+leyendas+gustavo+adolfo+becquer+rese%25C3%25B1a', is likely part of a phishing or content-scraping scheme. No scripts were extracted, but the structure strongly implies a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=rimas+y+leyendas+gustavo+adolfo+becquer+rese%25C3%25B1a PDF link annotation
    • https://cdn.sqhk.co/xedaberetaj/icBjj4r/62706743392.pdfIn PDF document text
    • http://kutatofol.22web.org/prefixes_and_suffixes_worksheets_4th_grade.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/lurozeno.pdfIn PDF document text
    • http://segijemidas.22web.org/shark_navigator_lift_away_deluxe_uv440.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/gjejaTR/musica_italiana_bruno_ferrara.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/jV8gjgc/jizafeverababikosidur.pdfIn PDF document text
    • https://lupofavegevo.weebly.com/uploads/1/3/5/3/135335207/bae0807415ada.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/4WVye4K/49105457256.pdfIn PDF document text
    • https://cdn.sqhk.co/telivagawu/gh1hhhh/24773764528.pdfIn PDF document text
    • http://difijeso.iblogger.org/full_antilog_table.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/7cd25a.pdfIn PDF document text
    • https://najusijas.weebly.com/uploads/1/3/5/4/135400897/5506959.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_b4c19850b15d4741b930a33ed19c93a7.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_e5f28d554e874cca99e65475910585d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f690a10-265d-4fb2-8be0-d11e9033466c/a_device_used_to_measure_current_voltage_and_resistance.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/line_6_hx_stomp_bass_presets.pdfIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_305c2077db31428191a2fd24e7cd627b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94cca7f-b0fc-42dd-842d-c19f334e55ef/project_management_software_tools_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a05283-480f-4fdc-96b0-44a12c26892a/canon_powershot_sx150_internal_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085223c8-0fc1-4eeb-b269-600cae78364a/temco_fireplace_customer_service.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/luxusaxikikazezil.pdfIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_114f482b00c74d87a7c0b6a6851a2548.pdf?index=trueIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_438ee267327a4061af7edc6676252fe5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/android_5._1_bypass_google_account_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/bumble_premium_mod_apk.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_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 5988 bytes
SHA-256: 40180ac3b619bcedd1d7761d0790825350278a5a12e48b38a66de79f33590174
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 12016 bytes
SHA-256: d0b2f35aa401e35dc2879b2ccad415c5b5314b3e12fe3d5e1c9ab23f9461b809