Malicious PDF — malware analysis report

Static analysis result for SHA-256 1449adeca49a9976…

MALICIOUS

PDF

75.6 KB Created: 2020-11-12 21:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a4ba09d074502844bdd2097415a90fdd SHA-1: 041665030b0f79acc0aae2ea411c202900040f87 SHA-256: 1449adeca49a9976cb2bd5dae694a1af0e63e1d18d7f27db994a6634d918e671
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The heuristic firings indicate a malicious redirector and a link farm, suggesting the document is designed to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or scam attempt.

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://ggtraff.ru/aws?utm_term=acaros+parasitologia+pdf In PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/rasojitapobe-datur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5f9b388daac9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5f98713444451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5f9355e1e01e5.pdfIn PDF document text
    • https://xuvowesajitox.weebly.com/uploads/1/3/4/6/134603534/892912.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/487738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_5f8db15fa265a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f94bbc034205.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/luborinizu/christopher_howard_arrest.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/66778011765.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_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 5312 bytes
SHA-256: b109b1aa6898560aeb44f74b2be8e7986f4bf516b91c7b1bc9df8f1e2222b92c
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 12500 bytes
SHA-256: 2ac92e110b64a37c35c9e3e98ce6a10e21182ba5c76e1acf028ca68622e523a9

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