Malicious PDF — malware analysis report

Static analysis result for SHA-256 30842280f4ae961e…

MALICIOUS

PDF

67.0 KB Created: 2020-12-20 12:21:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2355c025b81ba19775778874a50608d3 SHA-1: 2746d57dfd326fd55780f8952a3adc949428e289 SHA-256: 30842280f4ae961e130c1eace06d99f1aeb6fd6402ae1c7605a93ed88c437836
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host numerous external links, with one notable example being 'https://s3.amazonaws.com/pirosisob/calorimeter_problems_with_answers.pdf'. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic further support a phishing or redirection attack pattern. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure for further compromise.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=wisconsin+fishing+reports PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402244/normal_5fa9e8c7ab270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_5fa7db9dedce5.pdfIn PDF document text
    • https://maxubuzidam.weebly.com/uploads/1/3/4/4/134486229/wisefujax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f893db55852b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5fc9984120754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_5fa5abd508c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_5fb433055eb07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368984/normal_5fcbf09312bf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470543/normal_5fcc8c8c494f2.pdfIn PDF document text
    • https://delidenaluno.weebly.com/uploads/1/3/4/4/134438050/wotubafaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pirosisob/calorimeter_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/1854175573.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/allure_2018_movie.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_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 5048 bytes
SHA-256: 5d82749a6735035965bfa6dba6cd49b64abab4552520b30d0d42f2fdfa53d629
font_01_sfnt_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 10648 bytes
SHA-256: ba347f5d4b3d8f3214c751ed989f327778555029e6fa80283a334eefcca0fb88

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