Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f787eaf1dd0a03…

MALICIOUS

PDF

36.5 KB Created: 2020-06-06 14:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c3cbb4d7e6a62cfb64eeab9450f8d9a SHA-1: 10d2b983e994548129039f88a89f12dd44d6f218 SHA-256: a7f787eaf1dd0a03f8e0f2e486a1c9e9a955594f0561e11950f32da2fa8c4446
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, a technique often used for SEO poisoning or to direct users to malicious sites. The 'PDF_SEO_LINK_FARM' heuristic specifically flags this behavior, indicating a large number of external links within the document. The embedded URLs, such as 'http://rancemotorsports.com/uploads/1/3/0/6/130603725/130603725.html#matlab+for+engineers+4th+edition+holly+moore+free', suggest a lure to download or view content, which is a common social engineering tactic. No scripts were extracted from this sample.

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://rancemotorsports.com/uploads/1/3/0/6/130603725/130603725.html#matlab+for+engineers+4th+edition+holly+moore+free
    • http://mail.willsmall.com.au/uploads/1/3/0/5/130539837/jojogokuredol.pdf
    • http://amandacarew.com/uploads/1/3/0/3/130323164/5963957.pdf
    • http://klzfarmboyz.com/uploads/1/3/1/4/131436978/dizapinevi-nodale-luvubufisosu.pdf
    • http://poesie-maze.net/uploads/1/3/0/6/130621366/nopujaxanom.pdf
    • http://patriciadeanlmft.com/uploads/1/3/0/3/130313541/1601110.pdf
    • http://3u2.undesirable.us/uploads/1/3/0/5/130588747/1012721.pdf
    • http://summerreignmusic.com/uploads/1/3/0/5/130551564/vimedojok_fiwasopego.pdf
    • http://rancemotorsports.com/uploads/1/3/0/6/130603725/terms.html
    • http://rancemotorsports.com/uploads/1/3/0/6/130603725/dmca.html
    • http://rancemotorsports.com/uploads/1/3/0/6/130603725/policy.html
    • https://puroxil.files.wordpress.com/2020/06/75485779035.pdf
    • https://xaxuxite.files.wordpress.com/2020/06/97857554856.pdf
    • https://zetirufim.files.wordpress.com/2020/06/33353950326.pdf
    • https://tixiwufagu.files.wordpress.com/2020/06/59187262289.pdf
    • https://xexinemi.files.wordpress.com/2020/06/lelepiwevadiniwabijimavek.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_off00006340.bin
390bb9907d63ab488973735bfd1ea9dd6aba0e785367e9286beafec20da9739a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6340 10160 bytes

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