Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d2551445b3a8b9…

MALICIOUS

PDF

42.8 KB Created: 2020-03-19 08:01:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32e8436fc0c387c202489f15b770100d SHA-1: bbabd0117370f70a672fea048dc2c801eefe9ef1 SHA-256: 81d2551445b3a8b9dd9b74ad9a856433be2223e1dedf670fde1f8d9496f20ce6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the extensive link farm suggests the document's primary purpose is to redirect users to potentially malicious content or to manipulate search engine rankings. The embedded URLs are the highest priority IOCs.

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://4gen4.org/uploads/1/3/0/3/130379272/130379272.html#libros+1+bachillerato+ciencias+segunda+mano
    • http://murrietasalvationarmy.org/uploads/1/3/0/2/130291582/timejopopaw-bedelunuri.pdf
    • http://charlesheiner.net/uploads/1/3/0/7/130738837/7465603.pdf
    • http://ormansite.com/uploads/1/3/0/7/130739212/nunotuxigifepet.pdf
    • http://michaeleggerl.com/uploads/1/3/0/7/130775198/goxari_sozoderuxikiwuj_bebuge_doresum.pdf
    • http://ourmothershelper.com/uploads/1/3/0/5/130588187/zazimusuvus.pdf
    • http://chamoisinfo.com/uploads/1/3/0/6/130639750/fde0786325437.pdf
    • http://movingmedicineali.com/uploads/1/3/0/5/130588280/degudataku_pukululuf_berek_nijaguwalirimin.pdf
    • http://airstreaml2004jl.com/uploads/1/3/0/8/130813398/nenenutigoz.pdf
    • http://2clearlycharming.com/uploads/1/3/0/3/130323186/pogujowul_xetivikem_nelarogupapugo.pdf
    • http://raijinmartialarts.com/uploads/1/3/0/4/130476778/e8943ac7d9d211e.pdf
    • http://www.shoppedit.com/uploads/1/3/0/4/130489006/likilufakefonidot.pdf
    • http://www.surreypaintpros.com/uploads/1/3/1/0/131070178/zevan.pdf
    • http://www.thefirewoodguys.com/uploads/1/3/0/7/130739221/cf0086ca.pdf
    • http://ixominnovations.com/uploads/1/3/0/8/130815311/1a61947.pdf
    • http://cprsd2.com/uploads/1/3/0/6/130604771/wosevo.pdf
    • http://hautedeity.com/uploads/1/3/0/9/130969153/xixege.pdf
    • http://store.shopandshine.com/uploads/1/3/0/4/130489627/5712207.pdf
    • http://hitfan.net/uploads/1/3/0/6/130621082/bijopotisile.pdf
    • http://www.isis.com.co/uploads/1/3/0/4/130483879/dde3bf43411b44f.pdf
    • http://deadguycottoncandy.com/uploads/1/3/0/4/130477719/f2dfc86.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_off00007a57.bin
4846859822b868ea3294aaaaf1738233611bf932f4bbf46adb44a57993b9e2d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A57 9584 bytes

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