Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98788ba36b8c93f…

MALICIOUS

PDF

75.5 KB Created: 2020-11-23 09:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 593c9aeb46fbfdcbb5b326c7d4deae9d SHA-1: b39e40a173d0357f180fadf3fece279dee78cc7b SHA-256: e98788ba36b8c93fa03ea203bc4db4d06a1e0778731c7e02298c37b7d7bf4aaa
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam campaign. The embedded content is heavily obfuscated, but the presence of external links and the ClamAV detection indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://trafftec.ru/aws?utm_term=blade+and+soul+warlock+beginner+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5fa6b524430f4.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/2743582.pdfIn PDF document text
    • https://wubomedigupuda.weebly.com/uploads/1/3/4/6/134696881/1893378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5fa7cd818b4a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fae0bd679eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_5faf4c4c8c45b.pdfIn PDF document text
    • https://gurogujanesoxub.weebly.com/uploads/1/3/4/5/134506981/bamakude-sibike-webedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f9e25d74bb45.pdfIn PDF document text
    • https://putoluxadap.weebly.com/uploads/1/3/4/7/134734973/wusedixoto.pdfIn PDF document text
    • https://nupariredarig.weebly.com/uploads/1/3/4/3/134357859/tovidefesudatalave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_5fa72c75bba6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_5fbb0c49b8677.pdfIn PDF document text
    • https://lelewamopubexab.weebly.com/uploads/1/3/4/3/134324934/bowazilaf_ganuvapekikil_rejufu.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/vapelurowar/90710895655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494390f3-8bc8-4d7e-aced-03a1258c67ec/nobivadoni.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 5452 bytes
SHA-256: eb12717d5d1c2729a56a827c847e420e61ee560717e1a20c83dd49a740e82002
font_01_sfnt_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 10464 bytes
SHA-256: 975d596c09103e596828556f328b576c4a161ff984d14fc5b0f9b4b15eeffde8
font_02_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 16744 bytes
SHA-256: b6e04a927c2012552519e1d950d70c0df76771797756fbc90fc2357d6becb0ad

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