Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42091620d98cfd3…

MALICIOUS

PDF

35.2 KB Created: 2020-06-02 02:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4738dfd2af898ffa330a93a22d6f364 SHA-1: 3c47e268ee0ce23b955a3e44e3f36fdb2e766d34 SHA-256: d42091620d98cfd39c99132cdb0d2d1e4175495a24ca448b62781586fc9f255f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body contains text related to currency forecasting and authoring application details, but the primary malicious activity appears to be the extensive link farm.

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://smileytolson.net/uploads/1/3/1/3/131380447/131380447.html#currency+forecasting+michael+rosenberg
    • http://personalizeddietsbycarol.com/uploads/1/3/0/7/130774977/pakaluvo.pdf
    • http://bfgcommercial.com/uploads/1/3/0/7/130776169/gepem_sovotogeboj_zorovunewepuzaw_mevomuxizuvuj.pdf
    • http://thenestfamilyresource.com/uploads/1/3/0/8/130874678/1b76b6f826c7e.pdf
    • http://ramblingsinthewilderness.com/uploads/1/3/0/4/130476423/mafupowumeluv-bisupugubazep-gebelazuzujib.pdf
    • http://lindsaymillsco.com/uploads/1/3/1/3/131398529/1b189bb64e18967.pdf
    • http://momshies.net/uploads/1/3/0/3/130379272/sipisudubekumotiniso.pdf
    • http://jaimisbrands.com/uploads/1/3/0/9/130968972/5250247.pdf
    • http://pawstothepath.com/uploads/1/3/1/4/131452804/tenuxeno-mixugufake.pdf
    • http://smileytolson.net/uploads/1/3/1/3/131380447/terms.html
    • http://smileytolson.net/uploads/1/3/1/3/131380447/dmca.html
    • http://smileytolson.net/uploads/1/3/1/3/131380447/policy.html
    • https://pukidolaza.files.wordpress.com/2020/06/34798169664.pdf
    • https://vufimadur.files.wordpress.com/2020/05/81311277000.pdf
    • https://vemupuki.files.wordpress.com/2020/05/55254565432.pdf
    • https://dakusimefas772971079.files.wordpress.com/2020/05/pidimavalewixowumepefuve.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_off00005d3b.bin
70c57a6e857a567a678782c094bb2975bb65fcf67903cdac324ca7f2b20ef688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3B 9872 bytes

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