Malicious PDF — malware analysis report

Static analysis result for SHA-256 b025994925fe9684…

MALICIOUS

PDF

35.7 KB Created: 2020-06-05 22:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ae195a2a12f7f50a8b9c2ceb24ebe7 SHA-1: 646abf967746c0d85b41de0808e4ae367b6c03ec SHA-256: b025994925fe9684fcdf6988d4b70cf9ecd2cc1397a4bac417af954f8d77a62b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body also contains a prominent URL, 'http://premierumbrella.com/uploads/1/3/1/4/131409442/131409442.html#battlestar+galactica+pilot+watch+onl', which is part of this link farm. This behavior suggests the document is designed to redirect users to potentially malicious content or to manipulate search engine rankings.

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://premierumbrella.com/uploads/1/3/1/4/131409442/131409442.html#battlestar+galactica+pilot+watch+onl
    • http://krutimodekurty2017.com/uploads/1/3/1/6/131607662/249175.pdf
    • http://datumimpact.com/uploads/1/3/0/4/130476396/3141e35351e.pdf
    • http://constructoramv.net/uploads/1/3/0/8/130814416/zejisetidefula_kegapuboduj_bamoluxamod.pdf
    • http://thegemstonegirls.com/uploads/1/3/0/4/130483273/kofuvedupawatub-jopebodikasopop.pdf
    • http://hcsuperpac.com/uploads/1/3/1/4/131407395/gomeja.pdf
    • http://iranbasecamp.com/uploads/1/3/1/3/131381772/duwejoso_xolef.pdf
    • http://faithmovesfirst.com/uploads/1/3/0/7/130739389/legowagewibogur.pdf
    • http://blessingsmission.org/uploads/1/3/1/4/131452981/jususosete.pdf
    • http://premierumbrella.com/uploads/1/3/1/4/131409442/terms.html
    • http://premierumbrella.com/uploads/1/3/1/4/131409442/dmca.html
    • http://premierumbrella.com/uploads/1/3/1/4/131409442/policy.html
    • https://wipafuvuz.files.wordpress.com/2020/06/3712043601.pdf
    • https://xewugof.files.wordpress.com/2020/06/legewinufuvumadepivugap.pdf
    • https://naxopovo.files.wordpress.com/2020/06/36184916576.pdf
    • https://zukibokukiki.files.wordpress.com/2020/06/sulelafifalitulimofejirif.pdf
    • https://pifejadaku.files.wordpress.com/2020/06/denawenamik.pdf
    • https://zunovaxolupo118517497.files.wordpress.com/2020/06/nanejofigarekopigi.pdf
    • https://xumitepobeba.files.wordpress.com/2020/06/53117996447.pdf
    • https://zisifexuse.files.wordpress.com/2020/06/tejoginu.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_off000060a8.bin
fa847cdf52ed7a9757bd70f240eda1997cfbda16085e0ab60a1d96b7c08ed6ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x60A8 10036 bytes