Malicious PDF — malware analysis report

Static analysis result for SHA-256 a974ceee00b5e8d3…

MALICIOUS

PDF

105.5 KB Created: 2021-03-23 03:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a464bcbc94918cc76b429f807f1220a7 SHA-1: 2979457ec0e6872a0b80b71b206c1b9931187d1f SHA-256: a974ceee00b5e8d38c1ed4958895bd15d4a5d692afeb849b79a6b90d4416a695
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicating it functions as a link farm. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging strongly suggests malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to 'invest in stocks for 2021' and 'wkhtmltopdf', suggesting a lure for financial scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=where+to+invest+in+stocks+for+2021 PDF link annotation
    • https://cdn.sqhk.co/kewusikata/jdHZcjf/48896981882.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/jqzT8jN/the_pet_store_word_search_4_letters.pdfIn PDF document text
    • https://cdn.sqhk.co/judebivon/FRgfWpU/sword_maker_game_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/JicQqC3/beautiful_couple_wallpapers_for_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/fusuzogik/heHxpje/dijopowonimosetalamemiwar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_99546dd56b344f36a6548e5412826681.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef23249-7fa4-4aa2-8998-374b90c51e9d/pekafewajupu.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_78f75999e9514062b58419b74001fe38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f76167c4-50f2-45ba-a937-e1eaa3d55d79/farming_simulator_15_ps3_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e850f87a-3cad-43db-a651-5d5b25c53293/mogetonasulo.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_c941daaf50de48d9b14b8893ff4f8ac3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/60510027954.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_572cf1e22d4344fba6d374d05fd79efc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91161ce6-ba5c-47a5-8cf5-ef8ce634a0b6/excel_vba_function_returns_multiple_values.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b94d0cf-f40f-4d52-98cd-ed9e30fa59d4/sharp_xe-a207w_manual.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_b4eb43fefa404d2db70faeb6083e462c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/75426462387.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/california_acknowledgement_form_2019.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_off00015fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA6 5192 bytes
SHA-256: 126077eba447b85db9e38b1c3f0a60371f6271b2a15d935f5027a4ed18553779
font_01_sfnt_off0001716f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1716F 11664 bytes
SHA-256: d1c29f995b11b4b148a14f212cdaae220390a9885f665d309e68cf846378533b