Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafa4f7578fe67b6…

MALICIOUS

PDF

100.3 KB Created: 2020-06-03 05:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceaaf221bc1a05e18d1332c8b1a22022 SHA-1: 8e11be01468fa24ae22167a70aa8ffcac41d62c1 SHA-256: eafa4f7578fe67b6bd6728eb602db1564b56c791d455f6b83088132c121d9e8f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to improve search engine rankings. The document body, though partially corrupted, contains text related to 'marriages and families intimacy dive' and a URL that is also present in the heuristics, suggesting a lure to a malicious website. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://adsl-63-204-18-34.benefitplans.org/uploads/1/3/2/3/132302830/132302830.html#marriages+and+families+intimacy+dive
    • http://blackhollywoodatlanta.com/uploads/1/3/1/8/131871919/jawokoxanigopida.pdf
    • http://jbauertruckinginc.com/uploads/1/3/1/4/131438766/49aa3f48f.pdf
    • http://paradisecoastreview.com/uploads/1/3/0/5/130590139/balikufapoguka-sotugixukolidel.pdf
    • http://48c.undesirable.us/uploads/1/3/1/6/131636969/5eeb454871.pdf
    • http://kpaircraftparts.com/uploads/1/3/0/9/130969415/396fce98d2f320.pdf
    • http://adsl-63-204-18-34.benefitplans.org/uploads/1/3/2/3/132302830/terms.html
    • http://adsl-63-204-18-34.benefitplans.org/uploads/1/3/2/3/132302830/dmca.html
    • http://adsl-63-204-18-34.benefitplans.org/uploads/1/3/2/3/132302830/policy.html
    • https://lakuvipejuz106751964.files.wordpress.com/2020/05/75449969754.pdf
    • https://jumitedav.files.wordpress.com/2020/05/zumuwobunitutezosuw.pdf
    • https://bikixaxapu55491205.files.wordpress.com/2020/05/xizagebev.pdf
    • https://tulasamogese.files.wordpress.com/2020/06/64127894040.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_off000161b6.bin
e443384bbf81151ec87570024b1a99e77f1f8a7c399fa1b4ffde5223d3527e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161B6 10520 bytes

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