Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a98d13c710403e…

MALICIOUS

PDF

44.2 KB Created: 2020-03-21 21:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dfc9e836c354447150a14e75e3f65051 SHA-1: 53beaf49960ef562cad55f6c9eb7b213e47ac84b SHA-256: 53a98d13c710403ef328d7b234e0ebfb979c2fb220341a9b4a28679a93717439
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO link farming or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body itself is largely obfuscated, but the presence of numerous URLs pointing to seemingly unrelated content suggests a deceptive lure to drive traffic to potentially compromised or malicious web pages.

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://yardsocket.net/uploads/1/3/0/4/130488812/130488812.html#objetivos+estrategicos+de+una+empresa+de+servicios+contables
    • http://himalayannarrowpathadventures.com/uploads/1/3/0/7/130740141/jogovasizuku-lajopo-furere.pdf
    • http://supportforsyria.com/uploads/1/3/0/8/130815381/sovotodapi-mulux-zujumoradi-saxawulegesofiz.pdf
    • http://talesofthewind.blog/uploads/1/3/0/7/130776421/5e1bdfd2.pdf
    • http://0800530988.com/uploads/1/3/0/6/130639116/7459783.pdf
    • http://mymassagedude.com/uploads/1/3/0/4/130476525/mawuvivolase.pdf
    • http://affinityhorseracing.com/uploads/1/3/0/4/130476152/vozili.pdf
    • http://rolcadservices.com/uploads/1/3/0/7/130775456/gapividijosipol-vurujiguwitake-ligev.pdf
    • http://redsquarecommercial.com/uploads/1/3/0/4/130436162/5930013.pdf
    • http://www.mentorherbizmembership.com/uploads/1/3/0/6/130639227/be0328bb.pdf
    • http://sweetbeenutrition.com/uploads/1/3/0/6/130604354/7f8a919f69b0.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_off000080bb.bin
e4119ea5f68b98f9e5d9839352cb5bbe7ccd1a119c92ef74fd6d5ffd029e3663		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BB 9108 bytes

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