Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd83bfd70bb18f8…

MALICIOUS

PDF

75.0 KB Created: 2021-03-30 13:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ab8ff85bbf1bf85c77f2b6a02ccf5ed1 SHA-1: f7b72ec21acd590a7793f371a3f7bc34465090d0 SHA-256: 7fd83bfd70bb18f8fd2a6cda3e321d49c72d6a22ba1b575282b84bed01f99b57
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized nature. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The embedded URL 'https://seumenha.ru/award?keyword=agronomic+soil+and+water+conservation+measures+pdf' is likely part of a lure to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://seumenha.ru/award?keyword=agronomic+soil+and+water+conservation+measures+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5ffe90286ba36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_606299df98015.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/jflgAia/wufenapetete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5fd6ec75d2aab.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/OBIhfzq/nail_art_designs_halloween.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_5fd9054b1aab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_605f3d7278bed.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/tigewibejageju/british_society_gastroenterology_guidelines_ulcerative_colitis.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/nagimasurasewej.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_39d52c8f165d41728b07259dee31e77d.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_3a586a582bac46fa9f8c5a62162820de.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_b787b06b1be5468bbcca26c52ac3889c.pdf?index=trueIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_f87277c6973e4850b215fd877bea32d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinezedu/how_do_you_reset_a_quiq_battery_charger.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_dde6124d9be94560ae9afc2c37ecf3e2.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_34d6f8d45e644421b7959d3dca154b7c.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_b8d7233cc20c4b10a992bdfafc805553.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_4b1bfe27e81b4773afeba9822ce23dfd.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_6c9826b907804b428c6a249055328fc0.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_off0000e6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 5616 bytes
SHA-256: 547ed69ed78801a70ee60f563c8a8155a27f71a1ccc73f17af83882e434e94a5
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10672 bytes
SHA-256: 64e776301888ee3982f2905736fae4636b55d09eb45e55a1cf24026e4a608d34