Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c27d3fcaafc649…

MALICIOUS

PDF

79.5 KB Created: 2021-03-21 07:50:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7ab96917336eb11dbe0c3dbb3c7f9bee SHA-1: 11308e1d0936bb045e7e49b9d7bd9c2a7f6a296a SHA-256: 59c27d3fcaafc6499b5260cc824e1bdc6a934be5083115b22f057f56bbb5220d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=briggs+and+stratton+450+oil+change PDF link annotation
    • http://all-system7.club/5_year_plan_template_powerpointpcdya.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/gju97HE/mepivib.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/aicihge/8271542064.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/international_law_commission_2020.pdfIn PDF document text
    • http://rineset.xyz/a_murder_is_announced_chapterwise_summary0u6jm.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/hx5gi8w/cartoon_slide_sound_effects_free_download.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/flashback_x4_dimensions.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/jehdjib/36169042692.pdfIn PDF document text
    • https://cdn.sqhk.co/kirovuwuvo/fxCRhdk/93136699589.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/jcmS5gi/how_much_space_does_50_chickens_need.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/how_to_write_excuse_me_in_spanish.pdfIn PDF document text
    • http://slmit.fun/51029559775ucfmi.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/56308377403.pdfIn PDF document text
    • http://mebelrostov.ru/samsung_ml-2165w_printer_toneri9nn4.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/Xijjfhe/port_lympne_zoo_postcode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/17506128815.pdfIn PDF document text
    • http://kosidigipetuvu.epizy.com/numero_de_formule_cerfa.pdfIn PDF document text
    • http://napilidowolaro.rf.gd/bemulifavunatinewe.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/dairy_free_egg_free_bisquick_pancakes.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/play_store_install_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/in_adams_fall_we_sinned_all_eviri.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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 5604 bytes
SHA-256: 2b152669d985ae66c76bab26d5bf3e40c10ebf6bfea17f380e99abeeb4099ddb
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 11252 bytes
SHA-256: 7bf8c40e2522f2f014f5a9d27337902f1e482ad4d6b2cd0e6770b7708e0b7d1c

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