Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6daf158c9cacc17…

MALICIOUS

PDF

36.0 KB Created: 2020-04-11 03:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-15
MD5: ff598595fdd3742f5cd9a733acd56961 SHA-1: 75d05df5d36aad0d91bf27449cc129be96140130 SHA-256: b6daf158c9cacc1715341c3887aca9ce6b9fbab610702e78089005fae519f403
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, indicating a link farm or SEO spamming attempt. The document body is heavily obfuscated but contains references to URLs that are also present in the heuristic findings. No scripts were extracted from this sample, limiting the ability to determine further malicious intent beyond link distribution.

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://webdisk.ladse.org/uploads/1/3/0/4/130475994/130475994.html#energizer+aa+battery+data+sheet PDF link annotation
    • http://healthyvillagesinc.org/uploads/1/3/1/1/131163752/rebebofamafez-ralasidabokaze-zujaguvefux.pdfIn PDF document text
    • http://divorceagency.net/uploads/1/3/0/4/130435732/forepixokajos-dokew-zagepixi-botuwuleku.pdfIn PDF document text
    • http://wolfeplaster.com/uploads/1/3/0/6/130621917/46df5e89.pdfIn PDF document text
    • http://unikwities.com/uploads/1/3/0/5/130588506/dinurezarad.pdfIn PDF document text
    • http://cashindeeds.com/uploads/1/3/0/6/130604505/jitomavutobosotolanu.pdfIn PDF document text
    • http://steamkeystudios.com/uploads/1/3/0/4/130479210/6682488.pdfIn PDF document text
    • http://night-squirrel.com/uploads/1/3/0/7/130740000/fegebofamiwo-lumoribiv-donuf-xadezo.pdfIn PDF document text
    • http://bfbc-moshi.org/uploads/1/3/0/7/130738765/4022583.pdfIn PDF document text
    • http://anttikorhonen.fi/uploads/1/3/1/4/131437233/pitetafi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA8 8672 bytes
SHA-256: 46ced07e826901f622e5c972b4692645a5452adc5e47d60773411b184f245368
font_01_sfnt_off00006f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F48 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63