Malicious PDF — malware analysis report

Static analysis result for SHA-256 71401d980009c87b…

MALICIOUS

PDF

76.0 KB Created: 2020-06-12 04:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57b52bffb9d89dd3e69d5b5e9ebaf121 SHA-1: 89be8488cf307ad3c1d30697f5d78f3f220804f2 SHA-256: 71401d980009c87b53b017f531bf1acbef78ca0160db3a3c2d2faba0845d4633
136 Risk Score

Malware Insights

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

This PDF document contains numerous external links, suggesting a link farm or redirection mechanism. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a command-line context, a common technique for executing malicious commands. While no scripts were explicitly extracted, the presence of embedded URLs and the lure technique strongly suggest an attempt to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://superior-electrical-services.com/uploads/1/3/0/4/130435783/130435783.html#step+by+step+linux+guide
    • http://daniell-law.com/uploads/1/3/1/4/131407760/mokutozerowelulizama.pdf
    • http://middleclassmusings.com/uploads/1/3/0/7/130740048/wobitukiruke.pdf
    • http://hostmaster.stokemodelclub.co.uk/uploads/1/3/0/4/130436139/3a9c4.pdf
    • http://911flex.com/uploads/1/3/0/6/130639933/2e2926.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fugazuno.files.wordpress.com/2020/06/vopuvowejemowof.pdf
    • https://sewenam.files.wordpress.com/2020/06/jowomekunufexarufaje.pdf
    • https://zegikoduna.files.wordpress.com/2020/06/lukajegaw.pdf
    • https://bageredo.files.wordpress.com/2020/06/mavibobomabifafomabew.pdf
    • https://pevewedawisu.files.wordpress.com/2020/06/86417009999.pdf
    • https://rufutusizuk.files.wordpress.com/2020/06/76672735671.pdf
    • https://kawumafovod.files.wordpress.com/2020/06/22485782019.pdf
    • https://wigasoxela.files.wordpress.com/2020/06/vutetalodaxenivinuvob.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff99.bin
ea9fa7dcffbe5c3348b341da12ecfab9c57b31aef9dfedbe2a6bf8e24e717bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 10820 bytes

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