Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a6eae116ed1ee3…

MALICIOUS

PDF

66.6 KB Created: 2020-11-09 06:23:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4d8b4ac143713af36fdde4cfa98cbff9 SHA-1: 9c2f57d76c20a96a1a35a2573a580123c8ef6caa SHA-256: c8a6eae116ed1ee334b85bb71c47067bdef03ec0a7c0b01e8cb5e102d601e083
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://trafftec.ru/123?keyword=definition+of+diversifiable+risk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422890/normal_5fa875023dade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rezugekolaba/97815186293.pdfIn PDF document text
    • https://lusabun.files.wordpress.com/2020/11/41696583486.pdfIn PDF document text
    • https://derefaraduz.files.wordpress.com/2020/11/dauntless_repeater_guide.pdfIn PDF document text
    • https://vesituguz.files.wordpress.com/2020/11/47052364774.pdfIn PDF document text
    • https://fizafadolozu.files.wordpress.com/2020/11/31713389540.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/earn_to_die_hacked_unblocked_3.pdfIn PDF document text
    • https://dilopipo.files.wordpress.com/2020/11/demetivudaxakoleze.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/54846246295.pdfIn PDF document text
    • https://jugudiziva.files.wordpress.com/2020/11/nautical_almanac_2020_commercial_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/53260880174.pdfIn PDF document text
    • https://wejogude.files.wordpress.com/2020/11/niwasegini.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://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B48 4952 bytes
SHA-256: 2412f7d05b52f7b7ffe2ca40d3a7006bb0068b2764f79366977d6fbb07721273
font_01_sfnt_off00009bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF4 6300 bytes
SHA-256: f4621731e9c2c2c083dcfb72a0c7097a47f8c7d7878b5f2123de2531c532860d
font_02_sfnt_off0000ab4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4C 14616 bytes
SHA-256: 420a6fe453c3fd024d19c0ba23b472794bdd9e69d63841f9f01672f89d9c87c8
font_03_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 16148 bytes
SHA-256: da0a88900c7c8ffce761961373a20997519a27e3630e6436d6be3d0bdd95170e
font_04_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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