Malicious PDF — malware analysis report

Static analysis result for SHA-256 7591ab6ca950bc96…

MALICIOUS

PDF

34.3 KB Created: 2020-04-25 04:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da730b9998a6cedd4fae50324474c38e SHA-1: f75f8e5a0c60593b9fb14deefa8f86fe0ff2cf61 SHA-256: 7591ab6ca950bc9645055663899d82bcd03ac97011dd34f292dbc1ee40053e66
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDFs on various domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm the presence of numerous external URLs, suggesting a campaign to manipulate search engine results or distribute further malicious content. While no scripts were directly extracted, the nature of the link farm and the ML detection suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://swisscapillaires.ch/uploads/1/3/0/6/130604108/130604108.html#guided+reading+books+level+k
    • http://pjelectriciansandbuilderstenerife.com/uploads/1/3/1/3/131382828/rufimexalivag-remosano-lowipe-dorumatepuj.pdf
    • http://edsussman.info/uploads/1/3/0/6/130620309/83efc58b41c.pdf
    • http://mlpropertymaintenance.net/uploads/1/3/0/7/130776371/daf13c91.pdf
    • http://learningselflove.com/uploads/1/3/0/7/130776841/1754604.pdf
    • http://teamliveworldwide.us/uploads/1/3/1/4/131437079/sesodinoperajijazug.pdf
    • http://beautifulislife.com/uploads/1/3/0/4/130436365/sizitefozojisin_kiburirogunumo.pdf
    • http://ultrabrandrewards.com/uploads/1/3/0/6/130639532/sotonadajigufit.pdf
    • http://vintageeighteenwest.com/uploads/1/3/1/4/131410545/buges-detozixox-jatisomamu.pdf
    • http://the4thleveloffinancialfreedom.com/uploads/1/3/0/6/130620430/7739491.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_off00006140.bin
5aeb3cef44e8cec9926052004e4811f8852d54d67ee848c49843d221be2591e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6140 7172 bytes

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