Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bb11f9206b33ba…

MALICIOUS

PDF

39.4 KB Created: 2020-04-21 18:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c14a43ff22c71e2b6e9ea5b420f8b47 SHA-1: ce4be92724701673e0a3220a29e46070339470f5 SHA-256: c4bb11f9206b33ba9ebaa286774457ead5dd8169ac00b2e56607ec902c87dc95
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded document body text is heavily obfuscated and appears to contain URL fragments, further supporting the link farm attack pattern. 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://indoorqualityaircody.com/uploads/1/3/0/5/130590663/130590663.html#android+bitmap+compress+png
    • http://tmeisnerfit.com/uploads/1/3/0/5/130589237/petafel.pdf
    • http://wolfiesworks.com/uploads/1/3/0/4/130435658/8988826.pdf
    • http://mariachien.com/uploads/1/3/1/4/131453193/6743102.pdf
    • http://nextdeavor.net/uploads/1/3/0/7/130738946/kezaro.pdf
    • http://elizabethquigg.com/uploads/1/3/0/7/130775431/6099948.pdf
    • http://joyouslyraw.com/uploads/1/3/1/4/131437283/wufabovuz-mukoruroxul-dakesubununi-gekulijozekumi.pdf
    • http://bluffsboxbreaks.com/uploads/1/3/0/5/130590779/doxidawogosom-ponim-vavuv-bupovuge.pdf
    • http://nationbrotherhood.org/uploads/1/3/0/9/130969565/5c5e1a9fb53.pdf
    • http://landscapingkings.com/uploads/1/3/0/4/130435711/ribiloso.pdf
    • http://happyrewads.xyz/uploads/1/3/0/7/130775822/84a7cccc.pdf
    • http://tefldvd.com/uploads/1/3/0/7/130740019/seganiriwesowul.pdf
    • http://schumacherbrothersfencing.com/uploads/1/3/0/2/130292148/palulizutukifod.pdf
    • http://timberlakecrafts.net/uploads/1/3/0/6/130605230/9964651.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_off00007358.bin
22f6cc9197de8190b3382a2b53d347c0c765a9191ff9dc66d1712004ab3ce3e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7358 7832 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.