Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc87e724c125612…

MALICIOUS

PDF

41.2 KB Created: 2020-03-22 03:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 071d94701c03d1fd5d425ce6090d2fa3 SHA-1: c759b2c255a9f4b85806ccfcc510e3a189f2a6dc SHA-256: 0dc87e724c125612b85938c3ab2f90820aab015310f90ff12731296e25c652b7
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicating a link farm or redirection strategy. The ML classifier and heuristics strongly suggest malicious intent, likely related to SEO manipulation or hosting further malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://capefearforge.com/uploads/1/3/0/3/130379912/130379912.html#proceso+de+fabricacion+de+cemento
    • http://giuseppecognetti.com/uploads/1/3/0/2/130272284/domudowazotaden_jevag.pdf
    • http://indyfellowship.com/uploads/1/3/1/0/131070529/48697b2ac97b78.pdf
    • http://movertoolkit.com/uploads/1/3/0/4/130476079/jefavexuxiro_kavetavakilasi.pdf
    • http://procreditsol.com/uploads/1/3/0/7/130740266/bf93c629e95aea2.pdf
    • http://www.anitamorrissey.com/uploads/1/3/0/8/130874265/volerigamasu.pdf
    • http://websterwindows.net/uploads/1/3/0/8/130814100/28799.pdf
    • http://bteamshow.com/uploads/1/3/0/4/130436162/vogolujise.pdf
    • http://jljohnsonproperties.com/uploads/1/3/0/9/130969637/xizififodufin.pdf
    • http://openground.nz/uploads/1/3/0/2/130270974/zojujujanu.pdf
    • http://saluynutriciogirona.com/uploads/1/3/0/6/130603955/7871457.pdf
    • http://thehealthcurl.com/uploads/1/3/0/2/130289284/108f5cadbd469.pdf
    • http://air-africa.com/uploads/1/3/0/5/130588571/158f3f8261afce.pdf
    • http://mybloomyoga.com/uploads/1/3/0/6/130640239/xovifuvixusow.pdf
    • http://www.greenwave4thgraders.com/uploads/1/3/0/5/130588517/38a39d4456b52.pdf
    • http://reliablepowerequip.com/uploads/1/3/0/2/130274028/712b501d7a90fe.pdf
    • http://maddiemahermakeup.com/uploads/1/3/0/5/130551585/sitorukabevap-nevaxewodog.pdf
    • http://solit.studio/uploads/1/3/0/7/130776749/9434968.pdf
    • http://acnightmarket.com/uploads/1/3/0/7/130738527/613f0230.pdf
    • http://ttcasfriendsandfamily.org/uploads/1/3/0/6/130620865/fimexuzivezuxe.pdf
    • http://hyuk.info/uploads/1/3/0/7/130775845/gufefo-feloredaponokoz-xitogexowoju.pdf
    • http://johnsaundersartcom.com/uploads/1/3/1/1/131164048/b0f43f.pdf
    • http://bluesmokeband.com/uploads/1/3/0/3/130313067/jawewokexedapo_lukegegolipok.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_off00007623.bin
562414b50a058fe6c5eb0d6b9ffa2e8e426effe7b3c5a3d7c46eabea5089965a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7623 9176 bytes

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