Malicious PDF — malware analysis report

Static analysis result for SHA-256 8159c65db285fbc1…

MALICIOUS

PDF

39.4 KB Created: 2020-03-23 09:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d7c1298e49972dbeab5015130cbe257a SHA-1: c8dfad664eed8392229e10bb556494417326bc22 SHA-256: 8159c65db285fbc1352ed1b8cb9704f7ee0cf2420ffc930c854d3c5afa8ccfb1
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting an SEO spam or link farm tactic. The document body presents a lure about resetting a Samsung soundbar, directing users to external URLs. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://jamiefehr.com/uploads/1/3/1/1/131163601/131163601.html#how+to+reset+samsung+soundbar+hw-f450
    • http://jhillphotography.us/uploads/1/3/0/9/130969595/5294f5.pdf
    • http://servantfriendsministriesco.org/uploads/1/3/0/7/130775859/litipe.pdf
    • http://mrsmorones.com/uploads/1/3/0/5/130543168/paxiraruduwixid_fagapoxexu_lukase.pdf
    • http://firstrepublicbankcareers.com/uploads/1/3/0/5/130545185/bonolikafilulez_mobilat_tanezatunomami.pdf
    • http://www.jonsmithsubsandover.com/uploads/1/3/0/5/130541116/kugudimok.pdf
    • http://thefivemilliondollarbook.stefanaarnio.com/uploads/1/3/0/5/130588529/da6302.pdf
    • http://comemorandoavida.com/uploads/1/3/0/4/130436390/565089.pdf
    • http://timebtime.com/uploads/1/3/0/5/130588786/8736466.pdf
    • http://ats.tylersharris.com/uploads/1/3/0/6/130620928/buxigiwek.pdf
    • http://flatlandultrarunner.net/uploads/1/3/0/6/130620759/41751db4.pdf
    • http://cpanel.bhutanmindfultravels.com/uploads/1/3/0/5/130539440/79b4c298.pdf
    • http://estudiodiseno14.com/uploads/1/3/0/8/130814337/bozovajopizizisari.pdf
    • http://jetsetretail.net/uploads/1/3/0/9/130969062/vazuxipezixadudimuga.pdf
    • http://hostmaster.simon-bischof.ch/uploads/1/3/0/4/130488975/6741100.pdf
    • http://epichroniconline.com/uploads/1/3/0/7/130739561/795941.pdf
    • http://toptierpublishing.com/uploads/1/3/0/7/130775196/6995841.pdf
    • http://kingdomfaithandrevelation.org/uploads/1/3/1/0/131071038/6645925.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_off00006f81.bin
2cc958635cf0a5349461064ef12a82cd7fb0e0e4b5c01affcf8b6523eb8d2f04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F81 7900 bytes

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