Malicious PDF — malware analysis report

Static analysis result for SHA-256 adeae1887ee8f87f…

MALICIOUS

PDF

39.6 KB Created: 2020-04-02 06:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d860171e3621cd2a9de6bcf9a8ab48ef SHA-1: a8538faccb56fc7b6570167e9b773845015d4ecd SHA-256: adeae1887ee8f87f56f753b58293a4dd393b6cbbc1d2330357fb147228edaab9
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the title 'Historia humanismo y renacimiento' and references to wkhtmltopdf, suggesting a potential lure for users interested in such topics. The primary attack pattern appears to be SEO poisoning or a link farm designed to redirect users to numerous other PDF documents hosted on various domains.

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://michaelwellsart.com/uploads/1/3/1/4/131407284/131407284.html#historia+humanismo+y+renacimiento
    • http://thomasrileylaw.com/uploads/1/3/0/4/130489055/bipibox.pdf
    • http://niftyninniescleaning.com/uploads/1/3/0/5/130543467/1165281.pdf
    • http://shelbytowncenterapartments.com/uploads/1/3/0/8/130813797/2792025.pdf
    • http://cleansmartva.com/uploads/1/3/1/1/131164122/5452e6e0cbed31.pdf
    • http://coronamobileautoglass.com/uploads/1/3/0/7/130775786/vexawikojafupuron.pdf
    • http://nothingeasylifestyle.com/uploads/1/3/1/4/131406453/miteke.pdf
    • http://rkfilters.net/uploads/1/3/0/6/130621487/koritenorajen_tebusefa.pdf
    • http://masugalipzqueenscosmetics.com/uploads/1/3/0/6/130639061/8351017.pdf
    • http://vpcmanagement.com/uploads/1/3/0/5/130550826/9344044.pdf
    • http://www.wvrecovers.org/uploads/1/3/0/8/130874394/molopi.pdf
    • http://threefoolscoffee.com/uploads/1/3/0/7/130740212/guratirimazidikasex.pdf
    • http://repurposedpetals.com/uploads/1/3/0/6/130621854/8518695.pdf
    • http://myannuityguru.com/uploads/1/3/0/2/130272513/d74db6991c4.pdf
    • http://bestarizonahomesforsale.com/uploads/1/3/0/5/130550698/5562169.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_off00007053.bin
ceb50cfeecfa8a69caa0d43d7d99bb9dc19feb69ae1ca3615483a977033d3032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7053 8604 bytes

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