Malicious PDF — malware analysis report

Static analysis result for SHA-256 8881aada978e384e…

MALICIOUS

PDF

78.5 KB Created: 2021-04-28 22:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 70825ace77744b42c02a1680fb2dc684 SHA-1: 5d5f691aa204d541cb76bc247642e87440c22695 SHA-256: 8881aada978e384eca3726fa1434a8e83510a61d2d5334bfcb451da2325981e7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site for further exploitation, likely a phishing or scam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=seascape+with+sharks+and+dancer PDF link annotation
    • http://wulutano.mywebcommunity.org/an_introduction_to_language_and_linguistics_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411944/normal_601a3ff0bc08d.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/jPhcrSH/eve_echoes_guide_mining.pdfIn PDF document text
    • http://resokipuga.getenjoyment.net/neonatal_jaundice_management.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_6035ff9ec61e1.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/ibhbuxY/nuwubokasiruz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465257/normal_5fce1547e960f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_600e998c8f1c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415051/normal_5fe19b6dd3f43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375528/normal_5fff085a81ce5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384831/normal_6001c89e94ca7.pdfIn PDF document text
    • http://govuled.mywebcommunity.org/ligixubo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_8f80212733b146bbbdab0ff358e23ff6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/assimilation_psychology.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_92b22b5671354ebbb8804709e1a5d79a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/antivirus_java_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/74385583983.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_9a10451956ee477b88318d541b6ff14d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/adc0804_datasheet_texas_instruments.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_1478f8fb0e38477caa99fd7fc9eeaebe.pdf?index=trueIn PDF document text
    • http://larovitivejel.atwebpages.com/15786364478.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/norwegian_into_english_dictionary.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_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 5388 bytes
SHA-256: 82b3d5c4193d270fde624852871c535e5d3bf07e5d4be91882639fede8b98d2b
font_01_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 11232 bytes
SHA-256: f4b8f823adcb78c22d2e7a9e6cc7affb99a76ee5513010297d09991959358a4b

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