Malicious PDF — malware analysis report

Static analysis result for SHA-256 f575dce06d10fc81…

MALICIOUS

PDF

79.1 KB Created: 2021-02-28 12:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1c92d6010e28dea70a2a915508984e45 SHA-1: 94200d31a0d2f33a6dd94660f88200b554d08625 SHA-256: f575dce06d10fc81b993df8f9d9892c900b2cc6a7e4495f624198b4f9e6100a7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=mcgraw+hill+education+spanish+1+workbook+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481064/normal_6031b6e980c4d.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/3752858.pdfIn PDF document text
    • https://toxaxarobidilos.weebly.com/uploads/1/3/4/6/134689736/90fb7fcdb3.pdfIn PDF document text
    • https://muvitexovab.weebly.com/uploads/1/3/4/6/134639258/limabaxirugede-sizirosovilaga-kasafeboxidi-lisif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5ff3b79e3a0f9.pdfIn PDF document text
    • https://detitominaxa.weebly.com/uploads/1/3/5/3/135304018/lesekagufetajom-xakaruliwes-gejosomeleje-vetoguzefifera.pdfIn PDF document text
    • https://rifedisivivuze.weebly.com/uploads/1/3/2/8/132814279/9298242.pdfIn PDF document text
    • https://sawatulaboror.weebly.com/uploads/1/3/2/7/132710797/de12d1df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5fe86d5d5df7f.pdfIn PDF document text
    • https://puwirobazavuwo.weebly.com/uploads/1/3/1/4/131453501/3603639.pdfIn PDF document text
    • https://fitelibisubun.weebly.com/uploads/1/3/3/9/133987071/fixarigopubaz_zazojenabosix_sedutixuximij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470221/normal_60082b87a4c05.pdfIn PDF document text
    • https://jikegasabum.weebly.com/uploads/1/3/1/8/131856907/mudomijujobezekera.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
    • https://s3.amazonaws.com/mefadedosuw/how_to_learn_to_start_investing.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/christian_reformed_church_meaning.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 5632 bytes
SHA-256: 52ba9cb79ebddd836f8397b85ac9580ece490d07c6f7d218ff7fdd6081fc70c5
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 5572 bytes
SHA-256: 8409eb66272305dae8f2fb15244241c4dbaa8988bcbe3a84c04742ed09447b84
font_02_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 10304 bytes
SHA-256: 320c39d1de9945bba72cfccfe8a18bd3d2f74729f8c3b2f621589ba5176daf48
font_03_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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