Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f514b164d11a8a7…

MALICIOUS

PDF

36.1 KB Created: 2020-06-05 04:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9515228fdf238b46fd746317bbbe8f8 SHA-1: 721e8d8d58b0555e586845f3ba2251b1568390e3 SHA-256: 3f514b164d11a8a785b54c635e23ea4030e9bd6201ac552158fe534d538dfcb7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm designed to distribute malicious content or engage in SEO abuse. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body text is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious activity.

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://whyagileteamsfail.com/uploads/1/3/0/5/130539888/130539888.html#descargar+wrc+5+pc
    • http://firstworldnewpaltz.com/uploads/1/3/0/8/130814441/2ec66adf362.pdf
    • http://savecottleville.com/uploads/1/3/1/4/131454762/mubal.pdf
    • http://kauaiwellnessmassage.com/uploads/1/3/0/6/130621554/ea676e879273.pdf
    • http://infocusem.com/uploads/1/3/0/2/130291783/6560620.pdf
    • http://christmastreesfortcollins.com/uploads/1/3/1/4/131406687/lufumovewolo.pdf
    • http://toutlestote.com/uploads/1/3/0/9/130969270/basogak_budazi_faxun.pdf
    • http://sealavienj.com/uploads/1/3/0/8/130873771/rekojo.pdf
    • http://whyagileteamsfail.com/uploads/1/3/0/5/130539888/terms.html
    • http://whyagileteamsfail.com/uploads/1/3/0/5/130539888/dmca.html
    • http://whyagileteamsfail.com/uploads/1/3/0/5/130539888/policy.html
    • https://tipubek.files.wordpress.com/2020/06/zudaredolepofojuta.pdf
    • https://gavadopojame.files.wordpress.com/2020/06/38187194517.pdf
    • https://kijukadolok.files.wordpress.com/2020/06/56040297804.pdf
    • https://lirajobavan.files.wordpress.com/2020/06/51642818865.pdf
    • https://nalusekixij.files.wordpress.com/2020/06/75900415372.pdf
    • https://jumalorapof.files.wordpress.com/2020/06/salikifi.pdf
    • https://pikirumabe.files.wordpress.com/2020/06/79308981993.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_off00005f3b.bin
eebd7a22eb4bb68fecbd5fe7fc902a6d1edf0f497381ee2a21da61fbef6ce42b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 11848 bytes

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