Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a24c2c6c2c07c3…

MALICIOUS

PDF

40.1 KB Created: 2020-04-07 03:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d5a4888a88abfa2a9d940ee636c1bc0a SHA-1: 84172b10a0783ff67d77b9e4eb118f39935c2042 SHA-256: f6a24c2c6c2c07c366bf2f92014e4201e98f957443a7737232ccb9bc478d8ec4
94 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of SEO poisoning or phishing by embedding a large number of external links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document's content, though partially obscured, includes a URL that appears to be a lure for comparison content, which is then followed by numerous other PDF links hosted on various domains. These links are the primary indicators of malicious activity, likely directing users to malicious sites or further stages of an attack.

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://solihullpcf.org/uploads/1/3/1/4/131453960/131453960.html#fahrenheit+451+book+to+movie+comparison
    • http://ptamarymunfordelementaryschool.com/uploads/1/3/0/5/130542859/situxujiju.pdf
    • http://alexpepstein.com/uploads/1/3/0/7/130776769/jilunokezi.pdf
    • http://delightfulgraze.com/uploads/1/3/0/4/130483871/kewera.pdf
    • http://usa-protection.com/uploads/1/3/0/6/130621176/2f4ba05a.pdf
    • http://wirzweiumdiewelt.de/uploads/1/3/0/4/130483041/43399d9ce5c.pdf
    • http://steveanddannythompson.com/uploads/1/3/0/6/130604599/xukoxikilodepas-tufakopiw-logikagajevu.pdf
    • http://esplinorganicsolutions.com/uploads/1/3/0/5/130539155/d610fa70.pdf
    • http://whitebrickhome.com/uploads/1/3/0/5/130589998/suzobis-wikep-nijomu-wukeba.pdf
    • http://customhypnotherapy.com/uploads/1/3/0/8/130874300/5937db.pdf
    • http://sandbarmidtown.com/uploads/1/3/0/9/130969571/vugoravira.pdf
    • http://brbuck.org/uploads/1/3/0/4/130476083/posezema_gajazagotugevif_panivekiseguvam.pdf
    • https://phdessay
    • 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_off00007280.bin
ece238b7991fd4c9bbef028aa0ee38c452acbabcca04d18df5d49ec60811564f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7280 8216 bytes

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