Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5d9b2659b1d8a4…

MALICIOUS

PDF

44.4 KB Created: 2020-03-14 21:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 036b965eb92f59aa32267a6b1bbc34c6 SHA-1: 7c4d44783f81522a97d3c8527b4a9bb63764c07c SHA-256: 6c5d9b2659b1d8a42ac2fbb21877cf981290341eaa77c3e621f27b1b5b9d720a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample, and the document body is heavily obfuscated, making it difficult to determine a precise user-facing 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://74-123-75-191.mgwnet.com/uploads/1/3/0/7/130740141/130740141.html#lyneal+guide+centre
    • http://headsuplife.com/uploads/1/3/0/7/130775876/053ffcd9caf5ba.pdf
    • http://74-123-72-170.mgwnet.com/uploads/1/3/0/4/130435811/ec56122f98.pdf
    • http://simsoup.com/uploads/1/3/0/5/130590191/5760944.pdf
    • http://digitalfreebies.net/uploads/1/3/0/6/130604604/mimofubowa-demodaledano-mewagaxerarox-dilunigerelugon.pdf
    • http://mylsathouse.com/uploads/1/3/0/9/130969209/pizuposifa.pdf
    • http://idahosluggers.org/uploads/1/3/1/0/131071188/konef.pdf
    • http://www.worldsmatrix.net/uploads/1/3/0/7/130776476/a36e8dff3.pdf
    • http://dodgeplanroomqa.com/uploads/1/3/0/6/130622111/8012006.pdf
    • http://bariatricsinc.com/uploads/1/3/0/6/130640048/wotajijuzajod.pdf
    • http://quickcustom.lawfirmelearning.com/uploads/1/3/0/3/130323593/a426223c7.pdf
    • http://brian-amos.com/uploads/1/3/0/7/130776340/1521898.pdf
    • http://beccakelley.com/uploads/1/3/0/7/130775284/jajijum-mixaj-ripopim.pdf
    • http://blackcastle-records.com/uploads/1/3/0/8/130814644/8155354.pdf
    • http://hidingspace.online/uploads/1/3/0/4/130436154/1732773.pdf
    • http://theapprovalgurus.com/uploads/1/3/0/6/130620998/fa25d9.pdf
    • http://monstermaniagame.com/uploads/1/3/0/5/130546237/7ee9e2c76417d.pdf
    • http://sortakidding.com/uploads/1/3/0/7/130740183/jubipodopaga.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_off000083e5.bin
94ae63166a0c15119588cb2e7101cd32144a62a1d087776ecc1a0972a0e6e1d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E5 8628 bytes

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