Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fb15826f4098c8…

MALICIOUS

PDF

39.0 KB Created: 2020-03-29 14:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 879bca1a5ac7aec3119c2df3edf40ca7 SHA-1: 8b58fc2f460395214b06ace3f093e975fec7d12f SHA-256: 14fb15826f4098c8cf93cabc33efe7163f843600fc29de47e7f3ff1eded228ce
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious. The document body text is largely unreadable binary data, but the presence of numerous SEO-like URLs suggests a deceptive or manipulative purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://theleawoodfamilydentist.com/uploads/1/3/0/2/130272319/130272319.html#texto+expositivo+causa+efecto+ejemplo
    • http://bluezonebahamas.com/uploads/1/3/0/9/130969700/lajetafu.pdf
    • http://cortesymusic.com/uploads/1/3/0/5/130545985/ropagodataketajifet.pdf
    • http://hmannesfaserninc.com/uploads/1/3/0/5/130589270/laretuwefoza_novowatowexoze.pdf
    • http://visitesguideesedimbourg.eu/uploads/1/3/1/1/131164322/408824.pdf
    • http://toppletheking.org/uploads/1/3/0/5/130589098/kumamu-nunowobiduzax-bapowosori-lixewup.pdf
    • http://claudealarcon.com/uploads/1/3/1/1/131164549/dosejuwisodono.pdf
    • http://angela-cummings.com/uploads/1/3/0/8/130814642/0f577fed5.pdf
    • http://thelavendermermaid.com/uploads/1/3/0/6/130639774/seribolijumuk.pdf
    • http://wkapparel.com/uploads/1/3/0/6/130620574/9362093.pdf
    • http://inkhadejahsfootsteps.com/uploads/1/3/0/7/130775151/12f8b0877ac881.pdf
    • http://www.centrecollegialalberta.com/uploads/1/3/1/3/131380739/2cd29d7b9956d8.pdf
    • http://bulletininternationallawyermoves.com/uploads/1/3/0/5/130551188/lodajafebug-zadixepim-bazafija.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_off00006c6a.bin
a78ab4c6a7385f968e5814953d7af54b15a64b438ead3e7a93d4eb6fd2c14134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6A 9348 bytes

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