Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb15d7954aa88a70…

MALICIOUS

PDF

75.3 KB Created: 2021-04-07 15:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e41bcbf16075b2826569f8ab2847b493 SHA-1: dca0d9becea6cafea40d321520b6a7ceb80350fd SHA-256: bb15d7954aa88a70b322b6c54bb3fae34b54f28a23303cb76acf6c0c410978a1
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to PDF files hosted on link farm domains, indicating a likely attempt to manipulate search engine rankings or distribute malicious content. The presence of a 'link farm' heuristic and multiple unknown reputation URLs strongly suggests a malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vilenefex.ru/123?utm_term=pakistan+match+weather+report
    • https://cdn.sqhk.co/sirojenu/iBfjdmK/8570375023.pdf
    • https://cdn.sqhk.co/rasidepad/hfnY8jg/87556026830.pdf
    • https://cdn.sqhk.co/pafevola/jw4jc7n/basketball_free_throw_key_dimensions.pdf
    • https://cdn.sqhk.co/tibapopedeka/gwVrhdc/best_online_photo_printing_chennai.pdf
    • https://cdn.sqhk.co/kitatoze/ia3oiZD/mulololu.pdf
    • https://static.s123-cdn-static.com/uploads/4402246/normal_5ffa6ddc5b0a3.pdf
    • https://cdn-cms.f-static.net/uploads/4451352/normal_606acc2a7f805.pdf
    • https://cdn-cms.f-static.net/uploads/4387031/normal_600bf4f259ca3.pdf
    • https://static.s123-cdn-static.com/uploads/4367624/normal_5fecae315fb69.pdf
    • https://cdn.sqhk.co/visesefider/jjhhhgh/koginuvasevafeze.pdf
    • https://cdn.sqhk.co/ropobemuma/hjifPaA/31509363124.pdf
    • https://static.s123-cdn-static.com/uploads/4455886/normal_5ffd60b87ec30.pdf
    • https://cdn.sqhk.co/lerotakisisa/tgcifhd/82981279638.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/redegelesibif/87943154994.pdf
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_7eba0d79c04f47b099f4b879f67b2864.pdf?index=true
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_3268fc003858433f840eb32ded49428e.pdf?index=true
    • http://pozujig.epizy.com/deductive_reasoning_test_questions_and_answers.pdf
    • https://s3.amazonaws.com/jexijer/vaxibibusawonetuwu.pdf
    • http://gogidovegesoxe.epizy.com/antiseptico_definicion.pdf
    • http://panafinuniro.epizy.com/lean_canvas_template_for_powerpoint.pdf
    • http://noxokabebixe.epizy.com/61295098172.pdf
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_1e0d647899f8496fabd849bd7d68809a.pdf?index=true
    • https://s3.amazonaws.com/xozeb/sogutupoxuvileg.pdf
    • http://mevomum.epizy.com/digedapanowanewajunada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea05.bin
200b02fb69b6ceb1c1a311ffd601f9cb20080641c2a0c2ebc2fcbda533635144		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 5296 bytes
font_01_sfnt_off0000fbf8.bin
aee065a342e2b501d6a1597b57323a98b2c362dd8e86268986b896c9b767e02a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 10564 bytes

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