Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43282f7d5b652be…

MALICIOUS

PDF

74.9 KB Created: 2021-03-11 18:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9559894139a11c63ce19054576605a91 SHA-1: 5feddf0ba5649eb5a1192e1d0a4a4ab0625047e6 SHA-256: c43282f7d5b652be152db6b2e84c86b62e09ee68eb437e90f7533b11adfc2c28
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 SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics point towards it being used as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/award?keyword=foam+bricks+manufacturing+process+pdf PDF link annotation
    • http://vijexibat.mywebcommunity.org/viper_lc3_4706v_installation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_5fdb01969b3c7.pdfIn PDF document text
    • http://basagutidabe.sportsontheweb.net/49436690829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_601dcbdd5d89b.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/ce7hhgc/wwe_network_free_version_sign_up.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/how_to_write_something_as_a_product_of_prime_factors.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5fef6dcac3541.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/hbzDhe2/98517440330.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/41448588160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385038/normal_5fcf5c83baef5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sebokegekesuded.atwebpages.com/33073969988.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_93536bb39711483d99b50ebb4082513f.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_a5c6a1e360c547188babfa5b46264ae2.pdf?index=trueIn PDF document text
    • http://tumobuwixakeg.atwebpages.com/acuerdo_comercial_definicion.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_7d279c588c2a42bb97901d45db5a1646.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_7437ea13b65d496b966785d672614c0a.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_2a5fa0d3489a4c96ac708817c9ccf134.pdf?index=trueIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_c693a4dc526f48cc9e72fb9aab47e3ee.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_69cbf03610d2449a91233263931e6ade.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_67e613d331a54bd9a62ba7322917dedb.pdf?index=trueIn PDF document text
    • http://zupitatip.atwebpages.com/82509339788.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/xixumipi.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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 5600 bytes
SHA-256: 47db4852061c2981ffa59bf3c49b861e2795b0e12999bfd0c45d9aad3e0b2965
font_01_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 10240 bytes
SHA-256: d38eb621a49bf822e033b3813f5fb1ce0ba5580763d6912a3f43c9563da87a35