Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f08e3fc3a097c3…

MALICIOUS

PDF

39.4 KB Created: 2020-03-11 03:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb12f25806010ec9104f02fd8d8dfc57 SHA-1: 39916088da5b2b5bb6561ed491177f45d2577364 SHA-256: 69f08e3fc3a097c383f666b940e2d50ccf7038baf125e0abfa1d79f150121ef3
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a method to distribute malicious content across many sites. While no scripts were explicitly extracted, the presence of embedded URLs within the document body and the ML classifier's high confidence indicate malicious intent, likely related to SEO manipulation or redirecting users to harmful sites.

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://www.capo-modding.com/uploads/1/3/1/1/131164524/131164524.html#personal+reference+letter+for+job+example
    • http://www.rodrives.com/uploads/1/3/0/5/130551467/podepogukorowiki.pdf
    • http://www.erwachendesfrausein.ch/uploads/1/3/0/7/130775275/8263979.pdf
    • http://www.diva-stylez.com/uploads/1/3/0/7/130739068/mewojevasikoroxemupe.pdf
    • http://www.browtiquecork.com/uploads/1/3/0/6/130604456/26bb6b0110.pdf
    • http://www.particuliere.co.uk/uploads/1/3/0/2/130272291/1655860.pdf
    • http://2ndstory.marketing/uploads/1/3/0/3/130313177/7949049.pdf
    • http://costumearty.com/uploads/1/3/0/5/130544625/3914872.pdf
    • http://emilyanothercup.com/uploads/1/3/0/6/130622110/8511029.pdf
    • http://www.martinezortholv.com/uploads/1/3/0/7/130775542/2664315.pdf
    • http://stupidityandsolace.com/uploads/1/3/0/8/130814057/kemifuxibafikow-perusabatu.pdf
    • http://ushomes888.com/uploads/1/3/0/4/130478819/9270002.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_off00007545.bin
d57acbba7eeb895a6161921aed1fe494af8b5dc162a779fe708c3251a2643880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7545 6828 bytes

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