Malicious PDF — malware analysis report

Static analysis result for SHA-256 923bf2e47934c523…

MALICIOUS

PDF

82.4 KB Created: 2021-03-13 15:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 95c3a38fe81af790f77cf3413c6afdbe SHA-1: 7c5d74c41940d20e5859780c2543aa7d890e0988 SHA-256: 923bf2e47934c52325e4b4fbbebecb68ba0362ab02dfbff8b47f2b8a006c029a
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and potentially malicious, with ML and ClamAV flagging it as phishing/malware. The embedded URLs, particularly 'https://jottigo.ru/award?keyword=lift+as+you+rise+bonang+mohale+pdf+download' and 'http://help-bluebadgecustomer.com/mujak5xzdv.pdf', are suspicious and likely lead to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

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://jottigo.ru/award?keyword=lift+as+you+rise+bonang+mohale+pdf+download PDF link annotation
    • http://help-bluebadgecustomer.com/mujak5xzdv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452376/normal_5ff538e605f8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5fdb76c2b57c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5ff772f8e0cd8.pdfIn PDF document text
    • https://jofexudu.weebly.com/uploads/1/3/5/2/135295173/b8ebdac76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464313/normal_5ffde288a8f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_603be81dc320c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391893/normal_5fecca1feb6bf.pdfIn PDF document text
    • http://business-open.online/telotitizefogaxuturub11hx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_601da91333f58.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/xavagidepaw-xulux-legajotezobij-bojobone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e19dc6-5da3-47e9-8ba0-d06108c4efe7/xutokerupomileja.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_208c2710a9e24ec0a6a4846d56cd6fcc.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_6f08b7ca91954b63a483e719e5a3e919.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_ac532b8b403841eabee93638d2a1a49e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60fdc18a-23fe-4916-b3fd-6e804a0877f7/whirlpool_cabrio_he_washer_troubleshooting.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_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 5728 bytes
SHA-256: 9bfb2f51edd0d9bb2a04f433f9f2d874fefe148e2bf4fffab9452c04e5d9a1ec
font_01_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 10932 bytes
SHA-256: b21981009a1ac0636f4ffaa9890207656435c02a627171b0c1aa5089a2382c2a

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