Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2e8dd9a8b44a9a…

MALICIOUS

PDF

65.4 KB Created: 2020-12-21 23:36:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0f8b4b4fd16cf1a3dd54906c8c64fb7f SHA-1: 9a8d97f66b1bd44e7fdfa4b9602274acd8c4ab48 SHA-256: fb2e8dd9a8b44a9a675d5b837c962229a2050ed9c6e67bb99db72dc5c912d5fa
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDFs hosted on disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. The presence of a critical heuristic firing for a malicious redirector link and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

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
  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=rearranging+formulas+worksheet+answer+key In PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/pitekozesu.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/ec810197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420430/normal_5fcd259cdc439.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/tikenaliduzawavuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5f93f73a2a888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5fb9ed3fd3fc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5f9093c39df53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_5f95d5f349e9f.pdfIn PDF document text
    • https://zajawegunane.weebly.com/uploads/1/3/4/3/134332092/fanorowuso.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/kixadonanoniduw.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/xujitezu/22519437444.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdf4cdb6394b41d6426f176/t/5fdfb3122baf317dc3b055e4/1608495891976/84750715213.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/12934912811.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/boxagugapuwelovub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54070c14dfd36fe0e2b11/t/5fd1dee18185f4776a0f665f/1607589602600/vokalekarerirofo.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_off0000c2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 5444 bytes
SHA-256: 43007d9e2ce5cbb950f092b7cc696a235630d4f4df38bd83e904471ec527cfdd
font_01_sfnt_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 10284 bytes
SHA-256: efed3417ad70fc9f393ece2d3f34f26b40d1467e19850afe759ff7f31e454582

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