Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09c26824d008435…

MALICIOUS

PDF

72.1 KB Created: 2020-12-19 15:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9e6fe9e8ccce19be4ce04b252d3f2500 SHA-1: 96d3850d74bcd21a97a0dc4bed85f595a8ff39b1 SHA-256: d09c26824d008435d08a5581181459f5bfff7bd73ef1568a4e44dfff15792018
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links. The ML classifier also strongly indicated maliciousness. The embedded links, such as 'https://cctraff.ru/aws?utm_term=emissivity+of+aluminum+sheet', are likely used to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is weaponized to facilitate malicious redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=emissivity+of+aluminum+sheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5fbae36b4f2df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5f947656d5dbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426819/normal_5fcd26cb7530c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474752/normal_5faa799ee4e42.pdfIn PDF document text
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/d3ae4723be803.pdfIn PDF document text
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/6219017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fdc2b1904ef0.pdfIn PDF document text
    • https://nakaleraba.weebly.com/uploads/1/3/4/6/134606700/xejejufofavufibus.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/xomepixo/short_english_story_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/corpus_linguistics_for_vocabulary.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdf24be48d292cf0c8a58b/t/5fd605ebe5ac58289618296c/1607861739993/campaign_plans_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/mukanimikawikabuzufabog.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/march_april_2019_calendar_template.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_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 5032 bytes
SHA-256: 6c01c7900fb2b0953cb2388a138f72d3884d2a8c0f2832f600d4f828499a62d1
font_01_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 10208 bytes
SHA-256: d1e227f6b8fc7149c35afc093ebaf64ad0834eb5711f986646cf9f1fed3679a4

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