Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c4f0ddde26c9f9…

MALICIOUS

PDF

36.5 KB Created: 2020-03-26 04:22:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d84ece6bf63648d5063cd0af09e95463 SHA-1: 9121f60832d0c6e1a2db4faadf286de8c347f0a1 SHA-256: d2c4f0ddde26c9f9e2c80e3ff5ccb5b90b7e99296c63ad94727572d8d0295888
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on different domains. This indicates a link farm strategy, likely intended to manipulate search engine rankings or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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://blackhawbuilders.com/uploads/1/3/0/8/130814873/130814873.html#hormones+produced+by+anterior+and+posterior+pituitary+gland
    • http://www.dantzlertaxesandmore.com/uploads/1/3/0/7/130775189/42224164a66bd.pdf
    • http://bradmathers.com/uploads/1/3/0/4/130489343/jokomuw-valelud.pdf
    • http://cscschorus.com/uploads/1/3/0/2/130287482/4187022.pdf
    • http://74-123-79-68.mgwnet.com/uploads/1/3/0/5/130550758/bokubumi.pdf
    • http://drmarkmellor.com.au/uploads/1/3/0/7/130775080/3693119.pdf
    • http://meganostillman.com/uploads/1/3/0/7/130776344/jozifetajo-sozewim.pdf
    • http://theroadtohome.net/uploads/1/3/0/6/130604338/banosuxebexonagisot.pdf
    • http://surreymobilepetgrooming.com/uploads/1/3/0/5/130550693/fbff3f7a457.pdf
    • http://mystrugglemyvictory.com/uploads/1/3/0/5/130588461/faduv_zibazukipuwal_sezulabexazirex.pdf
    • http://www.srvywatch.com/uploads/1/3/0/3/130313400/lodesal_fejov_mukuzarizogogep.pdf
    • http://mta-sts.mail.nathannegri.com/uploads/1/3/0/8/130814749/11e0e1.pdf
    • http://callylawson.com/uploads/1/3/0/6/130639305/nesibalo.pdf
    • http://starsstripesandgripes.com/uploads/1/3/0/7/130776446/7988158.pdf
    • http://www.ravenlounge.com.au/uploads/1/3/0/4/130483086/lumoje.pdf
    • http://www.jennifersangels.com/uploads/1/3/0/4/130483753/7755928.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_off000069d4.bin
e414057858670d6f895eb50a189d3e281b3946269debf65836f1a92cbe42db6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D4 6660 bytes

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