Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8b678fb4d110d3…

MALICIOUS

PDF

35.0 KB Created: 2020-06-03 21:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3599d6388dbb975110964617a9f029ff SHA-1: 1f8a27dcb51428fc60721a0b6b6667ad7f0f97a7 SHA-256: 9a8b678fb4d110d3b41561964b915166ce2bd6ea09ab0f87b6deb30c7f5dbe23
94 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of numerous external URLs suggests a link farm or redirection strategy. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://usa-autoss.com/uploads/1/3/0/5/130547024/130547024.html#iml+industria+meccanica+italy
    • http://askitchennklutter.com/uploads/1/3/0/7/130740116/guwakara-tebanujeki-jukiwufapinube.pdf
    • http://status2.infotechstudios.com.au/uploads/1/3/0/5/130551239/terisikij_lasefobejowoz_vizumamobe.pdf
    • http://moorebirthday.com/uploads/1/3/0/6/130639590/narevu.pdf
    • http://teamanyos.com/uploads/1/3/1/8/131857402/minib.pdf
    • http://monasteriumlab.eu/uploads/1/3/0/5/130546606/f8b742f2.pdf
    • http://bagsofowl.com/uploads/1/3/0/5/130544468/1754589.pdf
    • http://74-123-78-74.mgwnet.com/uploads/1/3/0/5/130589381/7b6dfae8af72f0c.pdf
    • http://conectamarketing.org/uploads/1/3/0/9/130969876/6772219.pdf
    • http://bryantalrescate.com/uploads/1/3/1/3/131398231/3313315.pdf
    • http://roomtunesapp.com/uploads/1/3/0/6/130639706/limisesud.pdf
    • http://usa-autoss.com/uploads/1/3/0/5/130547024/terms.html
    • http://usa-autoss.com/uploads/1/3/0/5/130547024/dmca.html
    • http://usa-autoss.com/uploads/1/3/0/5/130547024/policy.html
    • https://zakudapure.files.wordpress.com/2020/05/83494093925.pdf
    • https://rorobev.files.wordpress.com/2020/06/fopoxobadaxame.pdf
    • https://vavimanuda.files.wordpress.com/2020/05/14397735146.pdf
    • https://vasoponox.files.wordpress.com/2020/05/pojabirasowimeredamiwaba.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_off00005d98.bin
89bf281c3f5bd74ec908a0dbfcba6881012d1904df6d4e1d304dcf06501abb5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D98 10280 bytes

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