Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c49346b98d1955…

MALICIOUS

PDF

81.6 KB Created: 2021-04-06 04:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 212faed19708bb7fa586994fb9bac62b SHA-1: 493b9e7289f816ffd258a1ec9f66992a00127c72 SHA-256: 72c49346b98d19553f1438ef9c4e4efb1b4d69b6e06a1ce588b0885fbf136110
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO manipulation tactic. The presence of a malicious ML classification and ClamAV detection, along with the URL pointing to 'bologen.ru/strik', indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=harry+potter+book+set+amazon
    • https://narufana.weebly.com/uploads/1/3/4/6/134653256/7759944.pdf
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/cce41636b70.pdf
    • http://lnstagramverifiedbadge-form.com/12642140810o0so0.pdf
    • http://shopyou.online/secrets_of_the_federal_reserve_downloadxoxjz.pdf
    • https://lepeposozul.weebly.com/uploads/1/3/5/3/135317560/kexati.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/55d694de-c842-4030-be58-719555b34f21/xuvimetonabuwosaxenu.pdf
    • https://uploads.strikinglycdn.com/files/2d2abb4d-2ce6-40fc-b719-4eb6bfc4511b/automotive_standards_iso_ts_16949.pdf
    • https://uploads.strikinglycdn.com/files/06b9c772-0015-4738-89b0-229f0296a6fd/how_do_i_fix_my_brother_printer.pdf
    • https://uploads.strikinglycdn.com/files/1aad3aef-c3cc-4124-89e1-f8a873da15d4/nasatovojokubofab.pdf
    • https://uploads.strikinglycdn.com/files/18b46703-acaa-4cdc-98d2-492984683c95/how_many_calories_in_flatbread_subway.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_d36ca03a47b54407bace24f18ead8476.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a639d23e-82b5-4972-a603-9a704aa60820/wixisuje.pdf
    • https://uploads.strikinglycdn.com/files/f2bd31c1-25ca-408a-9042-93d70caedd27/wiferazadiwej.pdf
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_194846550ca84b2b9c47c4dde84aca0d.pdf?index=true
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_52dca65fee93447284116f359bd2b09e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/544ee002-22be-43c8-a60a-3dc20d6c20cb/fadinofinokivemidu.pdf
    • https://uploads.strikinglycdn.com/files/b748a505-364e-43c8-b0c5-6292a1b12b90/78251240208.pdf
    • https://uploads.strikinglycdn.com/files/631fc155-655c-4ec2-b2ee-90f9ba42b47a/what_size_tire_to_use_for_flipping.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff9.bin
897c0b5c8c059431d14d2a4cba50d8e41312088dc73a7c25498a4b62bdf28368		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 5248 bytes
font_01_sfnt_off000111c7.bin
23588e919fa57dfba6b331f185874ec0b7b93ce664247adf5abbebf07764058d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 11524 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.