Malicious PDF — malware analysis report

Static analysis result for SHA-256 128050d5818266cc…

MALICIOUS

PDF

40.4 KB Created: 2020-04-27 10:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d405bac2b5dcbd1bd2782412de4d616 SHA-1: 5b9b17b7d20c9c9b8d48c818bc185c8b03d74170 SHA-256: 128050d5818266cc55d67ee6a2659c71b366d984db4f81837ad08977bf8273d9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier strongly indicated maliciousness. The presence of embedded URLs and the structure of the document suggest it is designed to lead users to malicious sites or to download further payloads.

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://sdrvowners.org/uploads/1/3/1/4/131437977/131437977.html#handbook+of+alternative+assets+2nd+edition+pdf
    • http://dimattiadesigns.com/uploads/1/3/0/3/130313649/9554286.pdf
    • http://mrsdupreysclass.com/uploads/1/3/0/4/130483551/tuzipiso_moguvavawukiz_deradegubomi.pdf
    • http://cookeed.com/uploads/1/3/0/3/130324206/fubel.pdf
    • http://rickhwt.com/uploads/1/3/0/2/130288684/e82f1d65e6d2.pdf
    • http://k12higheredpartnerships.com/uploads/1/3/0/9/130969632/zofanusaz-vubezanoxame-bototoledijivel-vimilus.pdf
    • http://slaughters-bullies.com/uploads/1/3/1/4/131411411/f7fc6c8e1.pdf
    • http://snowyowlphoto.net/uploads/1/3/1/4/131408465/nafebofuxarur.pdf
    • http://healinggoddesses.org/uploads/1/3/1/4/131438353/daxodanarip-xarasowagud-nakaxogefeba.pdf
    • http://mcdermottministries.org/uploads/1/3/0/5/130539059/fokofax.pdf
    • http://biggamepregameparty.com/uploads/1/3/0/4/130489241/69d19115cbb.pdf
    • http://melissahooton.com/uploads/1/3/1/0/131071037/rowopifezab.pdf
    • http://joy-dogs.com/uploads/1/3/0/2/130273907/juzarepow.pdf
    • http://jchschoirs.com/uploads/1/3/1/4/131482933/gedijepekofig_gubegoluzuvu.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_off000075ea.bin
e910327e89d9c6eb2459ba8e171565bf8ee5bb969f051a1e32a633effd0a75b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EA 8008 bytes

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