Malicious PDF — malware analysis report

Static analysis result for SHA-256 6205003b631476d5…

MALICIOUS

PDF

43.1 KB Created: 2020-03-10 04:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 539cfec3d0b248632912013be843ccae SHA-1: d84607854f610d3fcb04489ade2aab8fb800d788 SHA-256: 6205003b631476d51834fe705ad62c35451582a35f98e78f6140766780e71a63
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'specific gravity' and 'pycnometer', suggesting a lure to disguise the malicious intent. The primary goal appears to be directing users to a vast network of linked PDF files hosted on numerous domains, likely for SEO spam or to distribute further malicious content.

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://lmi7fs.salon225.com/uploads/1/3/0/3/130324050/130324050.html#specific+gravity+of+coarse+aggregate+by+pycnometer
    • http://goeswithmycouch.com/uploads/1/3/0/6/130605219/eb2221ba42.pdf
    • http://carrizalesforwarding.com/uploads/1/3/0/6/130621345/4521421.pdf
    • http://sofiebal.com/uploads/1/3/0/5/130589299/013182cf.pdf
    • http://www.aceytuna.com/uploads/1/3/0/7/130738752/cc85333a3824cf.pdf
    • http://nikkileon.de/uploads/1/3/0/7/130776487/403bd6ea.pdf
    • http://hostmaster.vividconnections.co.uk/uploads/1/3/0/6/130604045/porejojagekapava.pdf
    • http://skunkruckus.com/uploads/1/3/0/4/130488470/2347763.pdf
    • http://creativelevity.com/uploads/1/3/0/6/130639762/e658861.pdf
    • http://towriteforyou.com/uploads/1/3/0/3/130313170/vizoju.pdf
    • http://ketomamacookies.com/uploads/1/3/0/5/130538941/324c26cb8.pdf
    • http://arcadesalvacioncarpinteria.com/uploads/1/3/0/6/130605206/doraduke_boxafunuwixexe_rurirabo.pdf
    • http://isfnrconf.org/uploads/1/3/0/8/130813698/0a0d27c.pdf
    • http://shopraebtq.com/uploads/1/3/0/2/130288643/vajukipezolul.pdf
    • http://www.standmagazine.net/uploads/1/3/0/6/130621025/ruxipujoxurib_nugebase.pdf
    • http://ipfail.net/uploads/1/3/0/7/130776123/wugegapinunizasapi.pdf
    • http://robs-crypto-tab.com/uploads/1/3/0/3/130323462/vitogenoxojat_muwofatetesidot.pdf
    • http://karandefallon.com/uploads/1/3/0/7/130739519/8f71e76f24.pdf
    • http://www.autowalco.nl/uploads/1/3/0/4/130435509/kojosomomedu.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_off00007f0d.bin
03dbb0bb236ae71574ccf3b1f7a37ed6f4f8e57e538d53bad858c92a81095b9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0D 8240 bytes

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