Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd36ae3a7f0a4ea…

MALICIOUS

PDF

79.6 KB Created: 2021-03-18 09:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 68ff933d80b97d73cf38acadbbfa7ccf SHA-1: a2a89159706db0734e92b3d95665ea5d938c2465 SHA-256: 5dd36ae3a7f0a4eada45e08800555727f2f112226e57e3d8a08161fdf0c78278
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://mezovuduw.ru/strik?utm_term=porque+tengo+manchas+en+el+cuello PDF link annotation
    • http://nicechange.space/zajogefidapexesuzumojezrl5n5.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/polunalupiri_wopevidazo_kiguresedobova.pdfIn PDF document text
    • http://rubyshup.space/how_good_is_cfa_certificationbjtml.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/be9827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_60377446a87a1.pdfIn PDF document text
    • http://xipelosowux.22web.org/the_case_for_a_creator_by_lee_strobel.pdfIn PDF document text
    • http://pidedex.22web.org/adjective_list_with_bangla_meaning.pdfIn PDF document text
    • http://hookup671.site/does_the_devil_really_wear_prada_case_study9yhu1.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/mifad_bonijabol_gudumixiretajes_kanepadim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5fe783a24d247.pdfIn PDF document text
    • https://bofakodejo.weebly.com/uploads/1/3/4/2/134265658/sidujizid.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/tipikaxe/the_death_cure_weebly.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/41180885967.pdfIn PDF document text
    • http://zojimako.rf.gd/nc_drivers_license_cost.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_bf5992632455476db2e1fa48f7af101e.pdf?index=trueIn PDF document text
    • http://dikuwipesunebo.rf.gd/52611562921.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_447c345e10974a02baa2f742745a6e99.pdf?index=trueIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_1db8b158997b47aa89ec8b4099208987.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/calories_in_a_sonic_double_bacon_cheeseburger.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_c4c6fab2249e405b9253f05ba6261f08.pdf?index=trueIn 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_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 5340 bytes
SHA-256: b86ef5a124f49a40285c7ad5fe44bd046f774fa3edd9ad9e9dbb359d295f9efc
font_01_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 11672 bytes
SHA-256: a82e652950d7ad8ed06852e1290cde24c60e38e9cf8e0867bb0f023cf19ea3ad

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