Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d38c113d1ce0377…

MALICIOUS

PDF

36.5 KB Created: 2020-06-12 09:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d55023421fdbef7f681a0b200c958dff SHA-1: 99ec39349408f6b38c3352c8810d723b1aa92a2b SHA-256: 3d38c113d1ce0377836c18d02ffa7d20af72b4f7c609479db5b0424ff0316e1e
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The document body, though partially obfuscated, includes a URL that aligns with the detected external links. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://host237.carmichaelnl.com/uploads/1/3/0/6/130604288/130604288.html#a+bed+for+winter+lesson+plans
    • http://lowcountryessentials.com/uploads/1/3/0/5/130551125/potixoru-zepoxewemimezew.pdf
    • http://2l3.undesirable.us/uploads/1/3/0/4/130483337/2454350.pdf
    • http://bankshomecare.com/uploads/1/3/0/6/130604945/faxuweru.pdf
    • http://codywbuck.com/uploads/1/3/0/5/130541140/7091925.pdf
    • http://realexcellentwork.com/uploads/1/3/0/3/130313069/7594180.pdf
    • http://wise-worth.com/uploads/1/3/1/4/131406434/biwonuz.pdf
    • https://gutelum.files.wordpress.com/2020/06/31427252982.pdf
    • https://bojuzovedopa.files.wordpress.com/2020/06/76246150237.pdf
    • https://kowitiwut.files.wordpress.com/2020/06/81703259088.pdf
    • https://badumazu.files.wordpress.com/2020/06/getamasekiwajusadoputov.pdf
    • https://tapaxat304323837.files.wordpress.com/2020/06/6313930941.pdf
    • https://lijopiwa.files.wordpress.com/2020/06/vibaleguvilijodimo.pdf
    • https://sorexujuselu680172323.files.wordpress.com/2020/06/62540837903.pdf
    • https://wubegupo.files.wordpress.com/2020/06/farugasejuri.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_off0000632e.bin
76d9038e5cbf556118327440f57d9cc333f320172e05f611b5db8444c0a69188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632E 10456 bytes

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