Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d591e5edc096ef…

MALICIOUS

PDF

78.5 KB Created: 2021-03-23 10:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d1ed327dfa09d5eb8821db2a9ffb2498 SHA-1: b813485550dc3684c5fe1b6ecd4a1dbc509c55bd SHA-256: 55d591e5edc096ef8fcc760d402f826c16471af99dd598e7239d66788cf188fb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to disposable hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

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://ponafet.ru/123?utm_term=aankhon+mein+teri+lyrics+song PDF link annotation
    • https://vamekalufigo.weebly.com/uploads/1/3/1/1/131163651/jumuxepatex_ladarot_febomopaf.pdfIn PDF document text
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/47ca170e00.pdfIn PDF document text
    • http://mebelintera.ru/soguvarevodaruwotazou2kwb.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/hjbv1lD/kaiser_permanente_pharmacy_bellingham.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/turupuruwupikusawoti.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/ijgesgg/dino_hunter_deadly_shores_hack_ios.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/rigawijunudewevabe6zvnn.pdfIn PDF document text
    • https://jowopuvuramikir.weebly.com/uploads/1/3/5/3/135313070/zuweroz-vezulat-dunanodu.pdfIn PDF document text
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/kutusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_b9530944e2c9418680a2fd9858f4143f.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_38af89680aba4293839749d841a18d79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf132b62-14e0-4cb9-bfb6-be920273e57f/kufisoxokanogasirijudaf.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_2be2047fcc434e06b63897022c9bd775.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/726c74e1-cccc-4d25-b2e1-0c8692584ccc/the_love_dare_book.pdfIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_213472506ae04adca6a032255942b661.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efeb12e0-e683-499b-8162-5f4e127b576e/81856671581.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 5368 bytes
SHA-256: 21fc9ba08fd41222ae9b25a80205093d8a29c538e09e45bd0b4f817396346feb
font_01_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 11492 bytes
SHA-256: 3cde30d06da6c5519328eef430ae925a16362ee398767eb0846dae533e9ecb24
font_02_sfnt_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 3312 bytes
SHA-256: 1a0ce881c8d24647a8830fe8d9ab04eed1a6703088b24a7a7e0299f88c4c9644

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