Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ab17e61fa30cb9…

MALICIOUS

PDF

39.1 KB Created: 2020-04-03 00:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 21990bd1bfd667ca4a1a24448f7fac19 SHA-1: c0421861e7f97c6ca2834be5a315bf4ae79289e2 SHA-256: 91ab17e61fa30cb967c698dde9b7a5dcb99472cbda2d31b3002bf87b536420b1
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or SEO spam tactic designed to drive traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection. No scripts were extracted, and the document body is heavily obfuscated, but the sheer volume of external links is the primary indicator of malicious intent.

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://hypnose-kinderwunsch.com/uploads/1/3/1/4/131414743/131414743.html#construccion+panel+thermochip
    • http://tsonlinetrading.com/uploads/1/3/0/7/130738909/309165.pdf
    • http://nannyagencytoronto.ca/uploads/1/3/0/6/130621530/datisitewefal.pdf
    • http://operationpurplepaws.org/uploads/1/3/0/8/130874575/4871465.pdf
    • http://ajpclothing.com/uploads/1/3/0/8/130813395/841108.pdf
    • http://iowajuniorcamp.com/uploads/1/3/0/6/130621407/9afc1ce4923.pdf
    • http://mycph.info/uploads/1/3/0/7/130738950/1450260.pdf
    • http://daycareterisbusiness.com/uploads/1/3/0/6/130621376/8325168.pdf
    • http://skymountainlabradoodles.com/uploads/1/3/0/7/130775339/cdd8800a94c1c.pdf
    • http://standingupforwomeninireland.com/uploads/1/3/0/4/130436190/a82ca6c39276ce.pdf
    • http://craftfoodandwinefestival.com/uploads/1/3/0/7/130775969/590450.pdf
    • http://jaziscakesandcupcakes.com/uploads/1/3/1/0/131070619/deboru.pdf
    • http://universalpriorities.org/uploads/1/3/0/7/130776878/343dfbd.pdf
    • http://thelearningnest.net/uploads/1/3/0/6/130621373/628aaa2.pdf
    • http://canllonga.es/uploads/1/3/0/6/130621292/696114a4ddf8.pdf
    • http://bowennation.com/uploads/1/3/0/4/130483551/6110028.pdf
    • http://metroartdesign.com/uploads/1/3/0/6/130639148/5c2c5aa3656bc.pdf
    • http://dexteritycorp.com/uploads/1/3/0/4/130483751/3778259.pdf
    • http://spydernetworkbusinesssolutions.com/uploads/1/3/0/3/130313130/ruraripotasoxupeju.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_off00006e79.bin
3170c32ea61b56bcfabcde7bb3b20179d1798fbd8df3cb80f74089df7d210c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E79 8648 bytes

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