Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c050dc744011e84…

MALICIOUS

PDF

95.0 KB Created: 2020-06-17 19:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4ac5fbf7e9bc05b29292fd8fc888a18 SHA-1: ddb761813f35ef6f2e4af200128e52b18bb0de78 SHA-256: 5c050dc744011e84096027ff31b5e59ef703c04846e2f7f9e3d26c9f42685458
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards a potential redirection or download mechanism. No scripts were extracted, but the overall structure and link farm heuristic indicate a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://tasmaniadisabilitylobby.com.au/uploads/1/3/1/0/131070523/131070523.html#the+100+by+michael+h+hart+pdf
    • http://barbellsandbuns.com/uploads/1/3/0/5/130539691/tutan_pesona_viperelizeluxu.pdf
    • http://3eb.undesirable.us/uploads/1/3/0/3/130313274/1f1c56683.pdf
    • http://mx.bodycareclinicriverside.com/uploads/1/3/0/3/130324152/sijubeta-wivojepipuxun.pdf
    • http://innovacionpublicitariamagenta.com/uploads/1/3/1/4/131438362/xinaxa.pdf
    • http://danzarinstudios.com/uploads/1/3/0/6/130640214/ralanatazafiko-mirajesuworuwax-sutoz.pdf
    • http://lkultrasoundinnovations.com/uploads/1/3/0/5/130590717/korolukumuj.pdf
    • http://starspangledbabe.com/uploads/1/3/0/8/130813601/8867b9bf7.pdf
    • http://ecuriebarnton.com/uploads/1/3/0/7/130739260/7088533.pdf
    • http://np-3.com/uploads/1/3/0/9/130969987/6296580.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d98.bin
785f23d4ccfaccfd06acdc863d9e21fb318888a725c74d4c7e704a8b47f90933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 5172 bytes
font_01_sfnt_off00012f2b.bin
8ceb762d866e47a76db4daf8316013ff247bca9a0c88ff4a181e85cb1de7cffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 7480 bytes
font_02_sfnt_off0001472b.bin
0a6650a2cd0a049904637717bfe1829328fae5f9efeb561b62b3b45ebf94bf79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1472B 12404 bytes

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