Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab940f0de6e13d42…

MALICIOUS

PDF

76.4 KB Created: 2021-03-11 01:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5e9ed83e1908f3963f08f67a1e315415 SHA-1: 4f9c578aa8a89d3744dba549674a6a27a251efb2 SHA-256: ab940f0de6e13d4222a9d0ec591352d4bf519034bc66718b2a3c30ef1c01a95b
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to link farms and potentially malicious sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ML classifier. The document body, though heavily obfuscated, appears to be a lure related to adjustable beds, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of multiple external links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=what+is+the+best+adjustable+bed PDF link annotation
    • http://tevubirufizibun.iblogger.org/42420217669.pdfIn PDF document text
    • http://razvivatel.blog/asset_management_process_flow5m3kq.pdfIn PDF document text
    • http://oneplusonemain.xyz/93359577553smg82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5ff40a4a535b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_6020c9c726d63.pdfIn PDF document text
    • http://giveaway2020.info/mamarigonataxusopuxafoniaxbsh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453102/normal_5fc870112801e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_0ae9e162782748c09dcfaf3f788e42e3.pdf?index=trueIn PDF document text
    • http://vusejukulerubip.rf.gd/93133324641.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_7198704cca9347f0881e6b50101f76e5.pdf?index=trueIn PDF document text
    • http://sovotovagito.epizy.com/madewaxepewetumi.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_d65d8fd7892e48b78397dd5fc02fdd82.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_ea62be857b2b41bb9747e67befe90b9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/25848021488.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/sheet_music_apps.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/ssl_pinning_bypass_android_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/fesapadagudev.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_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 5044 bytes
SHA-256: 32d26e9d92d3e3ac2eb182a4ac533b8df5142a9424b36d38f1b0830e50bfedb9
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 10580 bytes
SHA-256: 6a6acbdd828828cce98272e935455928506bc123fb723eef2f5e3d772f878651

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