Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff866758eee4e0fd…

MALICIOUS

PDF

57.8 KB Created: 2020-04-01 19:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c3ba19959ed72f62bab9cd5db0b2dcd SHA-1: 201a397a39109b6f3f39b3c4f5263e2a508d01ff SHA-256: ff866758eee4e0fdcd4e9a6074b1487a446a86825225005b14c05ed962758a36
94 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier with high confidence as malicious. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or redirection scheme. The document body text is minimal and appears to be metadata from the PDF creation tool, not user-facing content. The primary attack pattern involves leveraging these numerous external links to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://axistenceadventureacademy.com/uploads/1/3/0/4/130477245/130477245.html#elementos+basicos+del+balance+general
    • http://redmedicadigital.com/uploads/1/3/0/9/130969428/makivawip-luxexozejexojag.pdf
    • http://sjesthetics.com/uploads/1/3/0/3/130313657/4466309.pdf
    • http://soulstarmassage.com/uploads/1/3/1/1/131163927/samefuno.pdf
    • http://meredithsasseen.com/uploads/1/3/0/5/130589114/zedonirimalesu.pdf
    • http://wheelhorseparts.net/uploads/1/3/0/4/130488365/8f926fa01d66.pdf
    • http://pawpawlakerentals.com/uploads/1/3/0/7/130776001/1ff54e4dca65.pdf
    • http://kjosbeautifulmess.com/uploads/1/3/1/0/131070481/rotenawurezijuf.pdf
    • http://couleurbronze.com/uploads/1/3/0/5/130543207/e7120895fe97b8.pdf
    • http://topright.shop/uploads/1/3/0/4/130477146/79518.pdf
    • http://greenleafcommunityfarm.com/uploads/1/3/0/7/130775835/jepexugijati.pdf
    • http://susancolemanwrites.com/uploads/1/3/0/5/130588703/629100.pdf
    • http://themousehouseplanners.com/uploads/1/3/1/3/131379544/fexejabuk.pdf
    • http://sezerturak.net/uploads/1/3/0/4/130476539/5b7fc7ed.pdf
    • http://gingermelon.ca/uploads/1/3/0/7/130739177/repamaneputujelo.pdf
    • http://carpetwater.com/uploads/1/3/1/4/131407424/bc700071a09a1dd.pdf
    • http://detroitrealestateexpo.com/uploads/1/3/0/5/130588799/regupopikimupip-zasupijeforewa.pdf
    • http://ahpconsulting.org/uploads/1/3/1/4/131454178/1977111.pdf
    • http://firstclassmarketingagency.com/uploads/1/3/0/6/130621024/6201237.pdf
    • http://4wheelsand1home.org/uploads/1/3/0/5/130551935/xarudowir-rexakigokagani.pdf
    • http://finnit.org/uploads/1/3/0/6/130620574/a3f4978d8618e8f.pdf
    • http://distrinalstamarta.com/uploads/1/3/0/5/130550891/9237893.pdf
    • http://caffconsults.com/uploads/1/3/0/3/130379285/dokisurudemiximizize.pdf
    • http://ballispoint.com/uploads/1/3/0/5/130589217/6459697.pdf
    • http://criinternational.org/uploads/1/3/0/7/130775922/33a0e7.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e1.bin
6477f71ad85624473caafc1e0a3b984eeace82131b9261b8569db498579dc51d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E1 9248 bytes

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