Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb43cf6b055ccd6…

MALICIOUS

PDF

45.7 KB Created: 2020-10-30 14:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d785dfff03e653ee3162c251841900d5 SHA-1: 8e518771b5f8bc3ddc64d1225d329f4cfbed1fc1 SHA-256: edb43cf6b055ccd6bac17812eefc22eee34d1054cdb25f97bbb48709c1604557
154 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, indicating a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to 'measuring lung capacity lab answers' and includes URLs that are flagged as malicious redirectors. This suggests the file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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?keyword=measuring+lung+capacity+lab+answers In PDF document text
    • https://jumabesabixoduz.weebly.com/uploads/1/3/4/3/134368642/dokare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_5f8cbf28aea6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f8f12d1a1be5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5f9118953716c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5f9486b2283f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_5f9a51afe9583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f948b9bac0f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_5f97524bbd90e.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/d4f71ba7f239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_5f96bbc9a0bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5f8e0b13b991c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66CD 5212 bytes
SHA-256: cba1f8528e5f5ae4593f918d7d8ae4d39eab36d5c6145a7be4b2be72e75843aa
font_01_sfnt_off000078a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A7 10260 bytes
SHA-256: 0782f65e7362750cc5f7a70720c7ae46d58e1d8f998f1000c15b1163071ddd2a
font_02_sfnt_off00009ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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