Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f8d419bf47a387…

MALICIOUS

PDF

66.0 KB Created: 2020-04-01 22:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 481d5261db1e7d3a33bc5d60213b6313 SHA-1: 8e279d2613a8479787d584af2b56edd7f815fb54 SHA-256: 13f8d419bf47a387b4ea57d098d9b19aff2ca74168a149003ca4cf7cf44a020c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or SEO spamming operation, potentially leading to malicious content or further exploitation. 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://paolacapelli.com/uploads/1/3/0/5/130540128/130540128.html#the+essentials+of+computer+organizat
    • http://sunmakeragency.com/uploads/1/3/0/5/130540286/gizikoz.pdf
    • http://johnd2000.com/uploads/1/3/0/6/130621051/f14173f12c8.pdf
    • http://wisdominacan.com/uploads/1/3/0/8/130874277/a8f08fa6cfb.pdf
    • http://mtpaintings.com/uploads/1/3/0/2/130288761/fiweda_topote_bafosopuz_fufivi.pdf
    • http://j2constructiongroup.com/uploads/1/3/0/7/130739947/427005.pdf
    • http://donewithdoubt.com/uploads/1/3/0/3/130323789/39ec771a24373a.pdf
    • http://pulleyslearningacademyand.com/uploads/1/3/1/1/131164308/gigivufox.pdf
    • http://shannonsresaleonline.com/uploads/1/3/0/8/130814995/sinebufulojo.pdf
    • http://thesupremeperformanceacademy.com/uploads/1/3/0/5/130588574/jukagazi-dilafazaduwozo-waruxegono.pdf
    • http://marianahdesign.com/uploads/1/3/0/6/130603818/kuvepenagimipiz_podogogulalolo.pdf
    • http://andrianaediting.ca/uploads/1/3/0/6/130621447/zopifuxumusozuga.pdf
    • http://gladysnails.com/uploads/1/3/1/4/131408666/5083190.pdf
    • http://southernparadisecatering.com/uploads/1/3/0/2/130287937/jabekusofomebatog.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_off0000d90a.bin
aa65c52591ea6f8eb0d2ccc8756d29a99b5e346c64d2bd6680dbf30c252b7d5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 8812 bytes

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